Revert r95841 due to failing media_unittests on linux_shared bot.

media/audio/audio_manager_base.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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_AUDIO_AUDIO_MANAGER_BASE_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
 
 #include <map>
 
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager.h"
 
 class AudioOutputDispatcher;
 
 // AudioManagerBase provides AudioManager functions common for all platforms.
-class MEDIA_EXPORT AudioManagerBase : public AudioManager {
+class AudioManagerBase : public AudioManager {
  public:
   // Name of the generic "default" device.
   static const char kDefaultDeviceName[];
 
   AudioManagerBase();
 
   virtual void Init();
   virtual void Cleanup();
 
   virtual MessageLoop* GetMessageLoop();
@@ skipping 22 matching lines @@
   base::Thread audio_thread_;
 
   bool initialized_;
 
   AudioOutputDispatchersMap output_dispatchers_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_