chore: remove `browserDynamicTestingPlatform` as it is deprecated and was not part of rc.4

Closes #10319

modules/@angular/platform-browser-dynamic/testing.ts

@@ -25,11 +25,6 @@ export const platformBrowserDynamicTesting = createPlatformFactory(
     platformCoreDynamicTesting, 'browserDynamicTesting',
     INTERNAL_BROWSER_DYNAMIC_PLATFORM_PROVIDERS);
 
-/**
- * @deprecated Use {@link platformBrowserDynamicTesting} instead
- */
-export const browserDynamicTestingPlatform = platformBrowserDynamicTesting;
-
 /**
  * NgModule for testing.
  *
@@ -46,7 +41,7 @@ export class BrowserDynamicTestingModule {
 }
 
 /**
- * @deprecated Use initTestEnvironment with browserDynamicTestingPlatform instead.
+ * @deprecated Use initTestEnvironment with platformBrowserDynamicTesting instead.
  */
 export const TEST_BROWSER_DYNAMIC_PLATFORM_PROVIDERS: Array<any /*Type | Provider | any[]*/> =
     // Note: This is not a real provider but a hack to still support the deprecated

modules/@angular/router/karma-test-shim.js

@@ -74,7 +74,7 @@ Promise.all([
 
   testing.initTestEnvironment(
     testingBrowser.BrowserDynamicTestingModule,
-    testingBrowser.browserDynamicTestingPlatform());
+    testingBrowser.platformBrowserDynamicTesting());
 
 }).then(function() {
   // Finally, load all spec files.

test-main.js

@@ -77,7 +77,7 @@ System.import('@angular/core/testing')
       .then(function(browserTesting) {
          coreTesting.initTestEnvironment(
            browserTesting.BrowserDynamicTestingModule,
-           browserTesting.browserDynamicTestingPlatform());
+           browserTesting.platformBrowserDynamicTesting());
       });
   })
 .then(function() {

tools/public_api_guard/platform-browser-dynamic/testing.d.ts

@@ -2,9 +2,6 @@
 export declare class BrowserDynamicTestingModule {
 }
 
-/** @deprecated */
-export declare const browserDynamicTestingPlatform: (extraProviders?: any[]) => PlatformRef;
-
 /** @experimental */
 export declare const platformBrowserDynamicTesting: (extraProviders?: any[]) => PlatformRef;