refactor(core): Removed depricated lockRunMode (#10763)

BREAKING CHANGE: previously deprecated lockRunMode was removed; see deprecation notice for migration instructions.

Author: chuckjaz

modules/@angular/core/index.ts

@@ -14,7 +14,7 @@
 export * from './src/metadata';
 export * from './src/util';
 export * from './src/di';
-export {createPlatform, assertPlatform, disposePlatform, getPlatform, coreBootstrap, coreLoadAndBootstrap, PlatformRef, ApplicationRef, enableProdMode, lockRunMode, isDevMode, createPlatformFactory} from './src/application_ref';
+export {createPlatform, assertPlatform, disposePlatform, getPlatform, coreBootstrap, coreLoadAndBootstrap, PlatformRef, ApplicationRef, enableProdMode, isDevMode, createPlatformFactory} from './src/application_ref';
 export {APP_ID, PACKAGE_ROOT_URL, PLATFORM_INITIALIZER, APP_BOOTSTRAP_LISTENER} from './src/application_tokens';
 export {APP_INITIALIZER, ApplicationInitStatus} from './src/application_init';
 export * from './src/zone';

modules/@angular/core/src/application_ref.ts

@@ -46,17 +46,6 @@ export function enableProdMode(): void {
   _devMode = false;
 }
 
-/**
- * Locks the run mode of Angular. After this has been called,
- * it can't be changed any more. I.e. `isDevMode()` will always
- * return the same value.
- *
- * @deprecated This is a noop now. {@link isDevMode} automatically locks the run mode on first call.
- */
-export function lockRunMode(): void {
-  console.warn('lockRunMode() is deprecated and not needed any more.');
-}
-
 /**
  * Returns whether Angular is in development mode. After called once,
  * the value is locked and won't change any more.

tools/public_api_guard/core/index.d.ts

@@ -782,9 +782,6 @@ export declare class KeyValueDiffers {
 /** @experimental */
 export declare const LOCALE_ID: OpaqueToken;
 
-/** @deprecated */
-export declare function lockRunMode(): void;
-
 /** @experimental */
 export declare class ModuleWithComponentFactories<T> {
     componentFactories: ComponentFactory<any>[];