refactor: Move dom_adapter.ts to @angular/common (#32154)

This work is needed in preparation for turning tokens into tree-shakable injectables.

PR Close #32154

packages/http/test/BUILD.bazel

@@ -7,6 +7,7 @@ ts_library(
     # Visible to //:test_web_all target
     visibility = ["//:__pkg__"],
     deps = [
+        "//packages/common",
         "//packages/core",
         "//packages/core/testing",
         "//packages/http",

packages/http/test/backends/xhr_backend_spec.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {ɵgetDOM as getDOM} from '@angular/common';
 import {Injectable} from '@angular/core';
 import {AsyncTestCompleter, SpyObject, afterEach, beforeEach, beforeEachProviders, describe, expect, inject, it} from '@angular/core/testing/src/testing_internal';
 import {BrowserXhr} from '@angular/http/src/backends/browser_xhr';
@@ -18,7 +19,6 @@ import {XSRFStrategy} from '@angular/http/src/interfaces';
 import {Request} from '@angular/http/src/static_request';
 import {Response} from '@angular/http/src/static_response';
 import {URLSearchParams} from '@angular/http/src/url_search_params';
-import {ɵgetDOM as getDOM} from '@angular/platform-browser';
 import {setCookie} from '@angular/platform-browser/testing/src/browser_util';
 
 let abortSpy: any;

packages/http/test/static_request_spec.ts

@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import {ɵgetDOM as getDOM} from '@angular/common';
 import {describe, expect, it} from '@angular/core/testing/src/testing_internal';
 import {RequestOptions} from '@angular/http/src/base_request_options';
 import {ContentType} from '@angular/http/src/enums';