refactor(testing): remove deprecated test setup functions (#10600)

Remove test setup functions which were deprecated in rc5. See the
changelog for rc5 for how to update. In brief, instead of
`setBaseTestProviders`, use `TestBed.initTestEnvironment`.

modules/@angular/core/testing/test_bed.ts

@@ -378,46 +378,6 @@ export function getTestBed() {
   return _testBed;
 }
 
-/**
- * @deprecated use getTestBed instead.
- */
-export function getTestInjector() {
-  return getTestBed();
-}
-
-/**
- * Set the providers that the test injector should use. These should be providers
- * common to every test in the suite.
- *
- * This may only be called once, to set up the common providers for the current test
- * suite on the current platform. If you absolutely need to change the providers,
- * first use `resetBaseTestProviders`.
- *
- * Test modules and platforms for individual platforms are available from
- * 'angular2/platform/testing/<platform_name>'.
- *
- * @deprecated Use TestBed.initTestEnvironment instead
- */
-export function setBaseTestProviders(
-    platformProviders: Array<Type|Provider|any[]>,
-    applicationProviders: Array<Type|Provider|any[]>) {
-  if (platformProviders.length === 1 && typeof platformProviders[0] === 'function') {
-    (<any>platformProviders[0])(applicationProviders);
-  } else {
-    throw new Error(
-        `setBaseTestProviders is deprecated and only supports platformProviders that are predefined by Angular. Use 'TestBed.initTestEnvironment' instead.`);
-  }
-}
-
-/**
- * Reset the providers for the test injector.
- *
- * @deprecated Use TestBed.resetTestEnvironment instead.
- */
-export function resetBaseTestProviders() {
-  TestBed.resetTestEnvironment();
-}
-
 /**
  * Allows injecting dependencies in `beforeEach()` and `it()`.
  *