feat(L2toL2CDM): improve gas estimation

packages/contracts-bedrock/src/L2/L2ToL2CrossDomainMessenger.sol

@@ -10,6 +10,7 @@ import { IL2ToL2CrossDomainMessenger } from "src/L2/interfaces/IL2ToL2CrossDomai
 import { ISemver } from "src/universal/interfaces/ISemver.sol";
 import { SafeCall } from "src/libraries/SafeCall.sol";
 import { TransientReentrancyAware } from "src/libraries/TransientContext.sol";
+import { Constants } from "src/libraries/Constants.sol";
 
 /// @notice Thrown when a non-written slot in transient storage is attempted to be read from.
 error NotEntered();
@@ -92,12 +93,6 @@ contract L2ToL2CrossDomainMessenger is IL2ToL2CrossDomainMessenger, ISemver, Tra
     /// @param messageHash  Hash of the message that was relayed.
     event RelayedMessage(uint256 indexed source, uint256 indexed messageNonce, bytes32 indexed messageHash);
 
-    /// @notice Emitted whenever a message fails to be relayed on this chain.
-    /// @param source       Chain ID of the source chain.
-    /// @param messageNonce Nonce associated with the messsage sent
-    /// @param messageHash  Hash of the message that failed to be relayed.
-    event FailedRelayedMessage(uint256 indexed source, uint256 indexed messageNonce, bytes32 indexed messageHash);
-
     /// @notice Retrieves the sender of the current cross domain message. If not entered, reverts.
     /// @return sender_ Address of the sender of the current cross domain message.
     function crossDomainMessageSender() external view onlyEntered returns (address sender_) {
@@ -204,7 +199,7 @@ contract L2ToL2CrossDomainMessenger is IL2ToL2CrossDomainMessenger, ISemver, Tra
             successfulMessages[messageHash] = true;
             emit RelayedMessage(source, nonce, messageHash);
         } else {
-            emit FailedRelayedMessage(source, nonce, messageHash);
+            revert("L2ToL2CrossDomainMessenger: failed to relay message");
         }
 
         _storeMessageMetadata(0, address(0));