Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/test/test_blink_web_unit_test_support.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/test/test_blink_web_unit_test_support.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/path_service.h"
@@ skipping 77 matching lines @@
 
   url_loader_factory_.reset(new WebURLLoaderMockFactory());
   mock_clipboard_.reset(new MockWebClipboardImpl());
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   gin::V8Initializer::LoadV8Snapshot();
 #endif
 
   scoped_refptr<base::SingleThreadTaskRunner> dummy_task_runner;
   scoped_ptr<base::ThreadTaskRunnerHandle> dummy_task_runner_handle;
-  if (!base::ThreadTaskRunnerHandle::IsSet()) {
+  if (!base::MessageLoopProxy::current()) {
     // Dummy task runner is initialized here because the blink::initialize
     // creates IsolateHolder which needs the current task runner handle. There
     // should be no task posted to this task runner. The message loop is not
     // created before this initialization because some tests need specific kinds
     // of message loops, and their types are not known upfront. Some tests also
     // create their own thread bundles or message loops, and doing the same in
     // TestBlinkWebUnitTestSupport would introduce a conflict.
     dummy_task_runner = make_scoped_refptr(new DummyTaskRunner());
     dummy_task_runner_handle.reset(
         new base::ThreadTaskRunnerHandle(dummy_task_runner));
@@ skipping 265 matching lines @@
   DCHECK(base::MessageLoop::current());
   DCHECK(!base::MessageLoop::current()->is_running());
   base::MessageLoop::current()->Run();
 }
 
 void TestBlinkWebUnitTestSupport::exitRunLoop() {
   base::MessageLoop::current()->Quit();
 }
 
 }  // namespace content