Revert r95841 due to failing media_unittests on linux_shared bot.

media/audio/linux/audio_manager_linux.h

 // Copyright (c) 2011 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_LINUX_AUDIO_MANAGER_LINUX_H_
 #define MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_
 
 #include <set>
 
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager_base.h"
 
 class AlsaPcmOutputStream;
 class AlsaWrapper;
 
-class MEDIA_EXPORT AudioManagerLinux : public AudioManagerBase {
+class AudioManagerLinux : public AudioManagerBase {
  public:
   AudioManagerLinux();
 
   // Call before using a newly created AudioManagerLinux instance.
   virtual void Init();
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices();
   virtual bool HasAudioInputDevices();
   virtual AudioOutputStream* MakeAudioOutputStream(
@@ skipping 16 matching lines @@
   bool HasAnyValidAudioInputDevice(void** hint);
 
   scoped_ptr<AlsaWrapper> wrapper_;
 
   std::set<AlsaPcmOutputStream*> active_streams_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerLinux);
 };
 
 #endif  // MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_