Revert of Reland: Switch WindowedNotificationObserver to use base::RunLoop.

chrome/browser/chromeos/extensions/device_local_account_external_policy_loader_unittest.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 "chrome/browser/chromeos/extensions/device_local_account_external_policy_loader.h"
 
 #include <string>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 247 matching lines @@
   EXPECT_TRUE(base::ReadFileToString(test_dir_.Append(kExtensionUpdateManifest),
                                      &manifest));
   fetcher->set_response_code(200);
   fetcher->SetResponseString(manifest);
   fetcher->delegate()->OnURLFetchComplete(fetcher);
 
   // Wait for the manifest to be parsed.
   content::WindowedNotificationObserver(
       extensions::NOTIFICATION_EXTENSION_UPDATE_FOUND,
       content::NotificationService::AllSources()).Wait();
-  // Temporary solution to mimic the old behavior of
-  // WindowedNotificationObserver.
-  // TODO(https://crbug.com/695073): Likely this has to be removed, and the
-  // IsIdleForTesting check at the end of this test has to be either changed to
-  // a more specific check or removed.
-  content::RunAllPendingInMessageLoop();
 
   // Verify that the downloader is attempting to download a CRX file.
   fetcher = factory.GetFetcherByID(
       extensions::ExtensionDownloader::kExtensionFetcherId);
   ASSERT_TRUE(fetcher);
   ASSERT_TRUE(fetcher->delegate());
 
   // Create a temporary CRX file and return its path to the downloader.
   EXPECT_TRUE(base::CopyFile(
       test_dir_.Append(kExtensionCRXSourceDir).Append(kExtensionCRXFile),
@@ skipping 34 matching lines @@
   loader_->StopCache(shutdown_run_loop.QuitClosure());
   VerifyAndResetVisitorCallExpectations();
 
   // Spin the loop until the cache shutdown callback is invoked. Verify that at
   // that point, no further file I/O tasks are pending.
   shutdown_run_loop.Run();
   EXPECT_TRUE(base::MessageLoop::current()->IsIdleForTesting());
 }
 
 }  // namespace chromeos