Revert r95841 due to failing media_unittests on linux_shared bot.

media/audio/linux/alsa_output.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.
 //
 // Creates an output stream based on the ALSA PCM interface.
 //
 // On device write failure, the stream will move itself to an invalid state.
 // No more data will be pulled from the data source, or written to the device.
 // All calls to public API functions will either no-op themselves, or return an
 // error if possible.  Specifically, If the stream is in an error state, Open()
@@ skipping 28 matching lines @@
 #include "media/audio/audio_parameters.h"
 
 namespace media {
 class SeekableBuffer;
 };  // namespace media
 
 class AlsaWrapper;
 class AudioManagerLinux;
 class MessageLoop;
 
-class MEDIA_EXPORT AlsaPcmOutputStream : public AudioOutputStream {
+class AlsaPcmOutputStream : public AudioOutputStream {
  public:
   // String for the generic "default" ALSA device that has the highest
   // compatibility and chance of working.
   static const char kDefaultDevice[];
 
   // Pass this to the AlsaPcmOutputStream if you want to attempt auto-selection
   // of the audio device.
   static const char kAutoSelectDevice[];
 
   // Prefix for device names to enable ALSA library resampling.
@@ skipping 152 matching lines @@
   ScopedRunnableMethodFactory<AlsaPcmOutputStream> method_factory_;
 
   InternalState state_;
   float volume_;  // Volume level from 0.0 to 1.0.
 
   AudioSourceCallback* source_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AlsaPcmOutputStream);
 };
 
-MEDIA_EXPORT std::ostream& operator<<(std::ostream& os,
-                                      AlsaPcmOutputStream::InternalState);
-
 #endif  // MEDIA_AUDIO_LINUX_ALSA_OUTPUT_H_