Remove all remaining traces of MessageLoopProxy.

content/browser/notifications/platform_notification_context_unittest.cc

 // Copyright 2015 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 <stdint.h>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
@@ skipping 62 matching lines @@
       bool success,
       const std::vector<NotificationDatabaseData>& notification_datas) {
     DCHECK(store_notification_datas);
 
     success_ = success;
     *store_notification_datas = notification_datas;
   }
 
  protected:
   // Creates a new PlatformNotificationContextImpl instance. When using this
-  // method, the underlying database will always be created in memory. The
-  // current message loop proxy will be used as the task runner.
+  // method, the underlying database will always be created in memory.
   PlatformNotificationContextImpl* CreatePlatformNotificationContext() {
     PlatformNotificationContextImpl* context =
         new PlatformNotificationContextImpl(base::FilePath(), &browser_context_,
                                             nullptr);
     context->Initialize();
 
     OverrideTaskRunnerForTesting(context);
     return context;
   }
 
@@ skipping 319 matching lines @@
   ASSERT_EQ(10u, notification_database_datas.size());
 
   for (int i = 0; i < 10; ++i) {
     EXPECT_EQ(origin, notification_database_datas[i].origin);
     EXPECT_EQ(kFakeServiceWorkerRegistrationId,
               notification_database_datas[i].service_worker_registration_id);
   }
 }
 
 }  // namespace content