Move MessageLoop to base namespace.

media/base/test_helpers.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_BASE_TEST_HELPERS_H_
 #define MEDIA_BASE_TEST_HELPERS_H_
 
 #include "base/callback.h"
 #include "media/base/pipeline_status.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
+namespace base {
 class MessageLoop;
+}
 
 namespace media {
 
 // Return a callback that expects to be run once.
 base::Closure NewExpectedClosure();
 PipelineStatusCB NewExpectedStatusCB(PipelineStatus status);
 
 // Helper class for running a message loop until a callback has run. Useful for
 // testing classes that run on more than a single thread.
 //
@@ skipping 15 matching lines @@
   // Runs the current message loop until |this| has been signaled and asserts
   // that the |expected| status was received.
   //
   // Fails the test if the timeout is reached.
   void RunAndWaitForStatus(PipelineStatus expected);
 
  private:
   void OnCallback(PipelineStatus status);
   void OnTimeout();
 
-  MessageLoop* message_loop_;
+  base::MessageLoop* message_loop_;
   bool signaled_;
   PipelineStatus status_;
 
   DISALLOW_COPY_AND_ASSIGN(WaitableMessageLoopEvent);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_TEST_HELPERS_H_