Delete message loops from gcm unit tests.

components/gcm_driver/gcm_driver_desktop_unittest.cc

 // Copyright 2014 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 "components/gcm_driver/gcm_driver_desktop.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/location.h"
@@ skipping 138 matching lines @@
     return async_operation_completed_callback_;
   }
   void set_async_operation_completed_callback(const base::Closure& callback) {
     async_operation_completed_callback_ = callback;
   }
 
  private:
   base::ScopedTempDir temp_dir_;
   TestingPrefServiceSimple prefs_;
   scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
-  base::MessageLoopForUI message_loop_;
   base::Thread io_thread_;
   base::FieldTrialList field_trial_list_;
   scoped_ptr<GCMDriverDesktop> driver_;
   scoped_ptr<FakeGCMAppHandler> gcm_app_handler_;
   scoped_ptr<FakeGCMConnectionObserver> gcm_connection_observer_;
 
   base::Closure async_operation_completed_callback_;
 
   std::string registration_id_;
   GCMClient::Result registration_result_;
@@ skipping 1113 matching lines @@
   PumpUILoop();
   EXPECT_EQ(GCMClient::UNKNOWN_ERROR, unregistration_result());
 
   // DeleteToken operation will be invoked after GCMClient becomes ready.
   GetGCMClient()->PerformDelayedStart();
   WaitForAsyncOperation();
   EXPECT_EQ(GCMClient::SUCCESS, unregistration_result());
 }
 
 }  // namespace gcm