refactor(core): Remove toggles used for zoneless by default migration

this migration is complete both internally and externally

Author: atscott

packages/core/src/platform/bootstrap.ts

@@ -28,8 +28,6 @@ import {stringify} from '../util/stringify';
 import {isPromise} from '../util/lang';
 import {PendingTasksInternal} from '../pending_tasks_internal';
 
-const REQUIRE_ONE_CD_PROVIDER_BOOTSTRAP_MODULE = false;
-
 /**
  * InjectionToken to control root component bootstrap behavior.
  *
@@ -104,15 +102,6 @@ export function bootstrap<M>(
           ),
         );
       }
-      if (!envInjector.get(PROVIDED_ZONELESS) && !envInjector.get(PROVIDED_NG_ZONE)) {
-        if (REQUIRE_ONE_CD_PROVIDER_BOOTSTRAP_MODULE && !isApplicationBootstrapConfig(config)) {
-          throw new Error(
-            'Missing change detection configuration: ' +
-              'please add either `provideZoneChangeDetection()` or `provideZonelessChangeDetection()` ' +
-              "to the list of root providers in your application's bootstrap code.",
-          );
-        }
-      }
     }
 
     let onErrorSubscription: Subscription;

packages/core/src/platform/platform_ref.ts

@@ -10,7 +10,7 @@ import {compileNgModuleFactory} from '../application/application_ngmodule_factor
 import {BootstrapOptions, optionsReducer} from '../application/application_ref';
 import {validAppIdInitializer} from '../application/application_tokens';
 import {provideZonelessChangeDetectionInternal} from '../change_detection/scheduling/zoneless_scheduling_impl';
-import {EnvironmentProviders, Injectable, Injector, Provider, StaticProvider} from '../di';
+import {EnvironmentProviders, Injectable, Injector, Provider} from '../di';
 import {errorHandlerEnvironmentInitializer} from '../error_handler';
 import {RuntimeError, RuntimeErrorCode} from '../errors';
 import {Type} from '../interface/type';
@@ -19,11 +19,6 @@ import {NgModuleFactory, NgModuleRef} from '../linker/ng_module_factory';
 import {createNgModuleRefWithProviders} from '../render3/ng_module_ref';
 import {bootstrap, setModuleBootstrapImpl} from './bootstrap';
 import {PLATFORM_DESTROY_LISTENERS} from './platform_destroy_listeners';
-import {
-  getNgZoneOptions,
-  internalProvideZoneChangeDetection,
-} from '../change_detection/scheduling/ng_zone_scheduling';
-import {getNgZone} from '../zone/ng_zone';
 
 /**
  * The Angular platform is the entry point for Angular on a web page.
@@ -53,21 +48,8 @@ export class PlatformRef {
     moduleFactory: NgModuleFactory<M>,
     options?: BootstrapOptions & {applicationProviders?: Array<Provider | EnvironmentProviders>},
   ): Promise<NgModuleRef<M>> {
-    const defaultZoneCdProviders = [];
-    const ZONELESS_BY_DEFAULT = true;
-    if (!ZONELESS_BY_DEFAULT) {
-      const ngZoneFactory = () =>
-        getNgZone(options?.ngZone, {
-          ...getNgZoneOptions({
-            eventCoalescing: options?.ngZoneEventCoalescing,
-            runCoalescing: options?.ngZoneRunCoalescing,
-          }),
-        });
-      defaultZoneCdProviders.push(internalProvideZoneChangeDetection({ngZoneFactory}));
-    }
     const allAppProviders = [
       provideZonelessChangeDetectionInternal(),
-      ...defaultZoneCdProviders,
       ...(options?.applicationProviders ?? []),
       errorHandlerEnvironmentInitializer,
       ...(ngDevMode ? [validAppIdInitializer] : []),