fix(generators)!: Make scrub_ protected again

In PRs google#7602, google#7616, google#7646, google#7647 and google#7654 the @Protected
access modifier on scrub_ was not transcribed to the new
typescript signature.

BREAKING CHANGE: This makes scrub_ protected again, which will
break any code attempting to access this method from outside
a CodeGenerator subclass.

generators/dart/dart_generator.ts

@@ -224,7 +224,7 @@ export class DartGenerator extends CodeGenerator {
    * @param thisOnly True to generate code for only this statement.
    * @returns Dart code with comments and subsequent blocks added.
    */
-  scrub_(block: Block, code: string, thisOnly = false): string {
+  protected scrub_(block: Block, code: string, thisOnly = false): string {
     let commentCode = '';
     // Only collect comments for blocks that aren't inline.
     if (!block.outputConnection || !block.outputConnection.targetConnection) {

generators/javascript/javascript_generator.ts

@@ -251,9 +251,8 @@ export class JavascriptGenerator extends CodeGenerator {
    * @param code The JavaScript code created for this block.
    * @param thisOnly True to generate code for only this statement.
    * @returns JavaScript code with comments and subsequent blocks added.
-   * @protected
    */
-  scrub_(block: Block, code: string, thisOnly = false): string {
+  protected scrub_(block: Block, code: string, thisOnly = false): string {
     let commentCode = '';
     // Only collect comments for blocks that aren't inline.
     if (!block.outputConnection || !block.outputConnection.targetConnection) {

generators/lua/lua_generator.ts

@@ -193,7 +193,7 @@ export class LuaGenerator extends CodeGenerator {
    * @param thisOnly True to generate code for only this statement.
    * @returns Lua code with comments and subsequent blocks added.
    */
-  scrub_(block: Block, code: string, thisOnly = false): string {
+  protected scrub_(block: Block, code: string, thisOnly = false): string {
     let commentCode = '';
     // Only collect comments for blocks that aren't inline.
     if (!block.outputConnection || !block.outputConnection.targetConnection) {

generators/php/php_generator.ts

@@ -226,7 +226,7 @@ export class PhpGenerator extends CodeGenerator {
    * @param thisOnly True to generate code for only this statement.
    * @returns PHP code with comments and subsequent blocks added.
    */
-  scrub_(block: Block, code: string, thisOnly = false): string {
+  protected scrub_(block: Block, code: string, thisOnly = false): string {
     let commentCode = '';
     // Only collect comments for blocks that aren't inline.
     if (!block.outputConnection || !block.outputConnection.targetConnection) {

generators/python/python_generator.ts

@@ -276,9 +276,8 @@ export class PythonGenerator extends CodeGenerator {
    * @param code The Python code created for this block.
    * @param thisOnly True to generate code for only this statement.
    * @returns Python code with comments and subsequent blocks added.
-
    */
-  scrub_(block: Block, code: string, thisOnly = false): string {
+  protected scrub_(block: Block, code: string, thisOnly = false): string {
     let commentCode = '';
     // Only collect comments for blocks that aren't inline.
     if (!block.outputConnection || !block.outputConnection.targetConnection) {