Remove unreachable shutdown code from MTRDeviceController.

cleanupAfterStartup is no longer reachable and can be removed.

At that point, the only caller of controllerShuttingDown: on the factory is
MTRDeviceController_Concrete, so we can go ahead and change the argument type
accordingly.

At that point it becomes obvious that shutDownCppController and
deinitFromFactory are only called on MTRDeviceController_Concrete instances, so
those can move from MTRDeviceController_Internal to
MTRDeviceController_Concrete, and the implementations in MTRDeviceController can
be removed.

checkForInitError is now unused on MTRDeviceController, and can be removed. And
then "cleanup" is unused and can be removed.

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -339,105 +339,6 @@ - (void)shutdown
     MTR_ABSTRACT_METHOD();
 }
 
-// Clean up from a state where startup was called.
-- (void)cleanupAfterStartup
-{
-    // Invalidate our MTRDevice instances before we shut down our secure
-    // sessions and whatnot, so they don't start trying to resubscribe when we
-    // do the secure session shutdowns.  Since we don't want to hold the lock
-    // while calling out into arbitrary invalidation code, snapshot the list of
-    // devices before we start invalidating.
-    MTR_LOG("%s: %@", __PRETTY_FUNCTION__, self);
-    os_unfair_lock_lock(self.deviceMapLock);
-    auto * devices = [self.nodeIDToDeviceMap objectEnumerator].allObjects;
-    [_nodeIDToDeviceMap removeAllObjects];
-    os_unfair_lock_unlock(self.deviceMapLock);
-
-    for (MTRDevice * device in devices) {
-        [device invalidate];
-    }
-    [self stopBrowseForCommissionables];
-
-    [_factory controllerShuttingDown:self];
-}
-
-// Part of cleanupAfterStartup that has to interact with the Matter work queue
-// in a very specific way that only MTRDeviceControllerFactory knows about.
-- (void)shutDownCppController
-{
-    MTR_LOG("%s: %p", __PRETTY_FUNCTION__, self);
-    assertChipStackLockedByCurrentThread();
-
-    // Shut down all our endpoints.
-    for (MTRServerEndpoint * endpoint in [_serverEndpoints copy]) {
-        [self removeServerEndpointOnMatterQueue:endpoint];
-    }
-
-    if (_cppCommissioner) {
-        auto * commissionerToShutDown = _cppCommissioner;
-        // Flag ourselves as not running before we start shutting down
-        // _cppCommissioner, so we're not in a state where we claim to be
-        // running but are actually partially shut down.
-        _cppCommissioner = nullptr;
-        commissionerToShutDown->Shutdown();
-        // Don't clear out our fabric index association until controller
-        // shutdown completes, in case it wants to write to storage as it
-        // shuts down.
-        _storedFabricIndex = chip::kUndefinedFabricIndex;
-        _storedCompressedFabricID = std::nullopt;
-        self.nodeID = nil;
-        self.fabricID = nil;
-        self.rootPublicKey = nil;
-
-        delete commissionerToShutDown;
-        if (_operationalCredentialsDelegate != nil) {
-            _operationalCredentialsDelegate->SetDeviceCommissioner(nullptr);
-        }
-    }
-}
-
-- (void)deinitFromFactory
-{
-    [self cleanup];
-}
-
-// Clean up any members we might have allocated.
-- (void)cleanup
-{
-    VerifyOrDie(_cppCommissioner == nullptr);
-
-    if (_defaultDACVerifier) {
-        delete _defaultDACVerifier;
-        _defaultDACVerifier = nullptr;
-    }
-
-    if (_attestationTrustStoreBridge) {
-        delete _attestationTrustStoreBridge;
-        _attestationTrustStoreBridge = nullptr;
-    }
-
-    [self clearDeviceAttestationDelegateBridge];
-
-    if (_operationalCredentialsDelegate) {
-        delete _operationalCredentialsDelegate;
-        _operationalCredentialsDelegate = nullptr;
-    }
-
-    if (_partialDACVerifier) {
-        delete _partialDACVerifier;
-        _partialDACVerifier = nullptr;
-    }
-
-    if (_deviceControllerDelegateBridge) {
-        delete _deviceControllerDelegateBridge;
-        _deviceControllerDelegateBridge = nullptr;
-        @synchronized(self) {
-            _strongDelegateForSetDelegateAPI = nil;
-            [_delegates removeAllObjects];
-        }
-    }
-}
-
 - (NSNumber *)controllerNodeID
 {
     auto block = ^NSNumber * { return @(self->_cppCommissioner->GetNodeId()); };
@@ -968,19 +869,6 @@ - (void)removeServerEndpointOnMatterQueue:(MTRServerEndpoint *)endpoint
     [_factory removeServerEndpoint:endpoint];
 }
 
-- (BOOL)checkForInitError:(BOOL)condition logMsg:(NSString *)logMsg
-{
-    if (condition) {
-        return NO;
-    }
-
-    MTR_LOG_ERROR("%@ Error: %@", self, logMsg);
-
-    [self cleanup];
-
-    return YES;
-}
-
 - (void)clearDeviceAttestationDelegateBridge
 {
     if (_deviceAttestationDelegateBridge) {

src/darwin/Framework/CHIP/MTRDeviceControllerFactory.mm

@@ -906,7 +906,7 @@ - (void)resetOperationalAdvertising
     app::DnssdServer::Instance().StartServer();
 }
 
-- (void)controllerShuttingDown:(MTRDeviceController *)controller
+- (void)controllerShuttingDown:(MTRDeviceController_Concrete *)controller
 {
     [self _assertCurrentQueueIsNotMatterQueue];
 

src/darwin/Framework/CHIP/MTRDeviceControllerFactory_Internal.h

@@ -51,7 +51,7 @@ NS_ASSUME_NONNULL_BEGIN
 MTR_DIRECT_MEMBERS
 @interface MTRDeviceControllerFactory ()
 
-- (void)controllerShuttingDown:(MTRDeviceController *)controller;
+- (void)controllerShuttingDown:(MTRDeviceController_Concrete *)controller;
 
 /**
  * Get the list of running controllers.  This will include controllers that are

src/darwin/Framework/CHIP/MTRDeviceController_Concrete.h

@@ -54,6 +54,23 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (BOOL)startup:(MTRDeviceControllerStartupParamsInternal *)startupParams;
 
+/**
+ * Shut down the underlying C++ controller.  Must be called on the Matter work
+ * queue or after the Matter work queue has been shut down.
+ *
+ * Only MTRDeviceControllerFactory should be calling this.
+ */
+- (void)shutDownCppController;
+
+/**
+ * Notification that the MTRDeviceControllerFactory has finished shutting down
+ * this controller and will not be touching it anymore.  This is guaranteed to
+ * be called after initWithFactory succeeds.
+ *
+ * Only MTRDeviceControllerFactory should be calling this.
+ */
+- (void)deinitFromFactory;
+
 /**
  * Takes an assertion to keep the controller running. If `-[MTRDeviceController shutdown]` is called while an assertion
  * is held, the shutdown will be honored only after all assertions are released. Invoking this method multiple times increases

src/darwin/Framework/CHIP/MTRDeviceController_Internal.h

@@ -136,23 +136,6 @@ NS_ASSUME_NONNULL_BEGIN
                     fabricIndex:(chip::FabricIndex)fabricIndex
                       isRunning:(BOOL *)isRunning;
 
-/**
- * Shut down the underlying C++ controller.  Must be called on the Matter work
- * queue or after the Matter work queue has been shut down.
- *
- * Only MTRDeviceControllerFactory should be calling this.
- */
-- (void)shutDownCppController;
-
-/**
- * Notification that the MTRDeviceControllerFactory has finished shutting down
- * this controller and will not be touching it anymore.  This is guaranteed to
- * be called after initWithFactory succeeds.
- *
- * Only MTRDeviceControllerFactory should be calling this.
- */
-- (void)deinitFromFactory;
-
 /**
  * Ensure we have a CASE session to the given node ID and then call the provided
  * connection callback.  This may be called on any queue (including the Matter