Add CONTENT_EXPORT to AudioDevice::RenderCallback class.

content/renderer/media/audio_device.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.
 //
 // Low-latency audio rendering unit utilizing audio output stream provided
 // by browser process through IPC.
 //
 // Relationship of classes.
 //
 //  AudioOutputController                AudioDevice
@@ skipping 61 matching lines @@
 #include "base/threading/simple_thread.h"
 #include "content/common/content_export.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "media/audio/audio_parameters.h"
 
 class CONTENT_EXPORT AudioDevice
     : public AudioMessageFilter::Delegate,
       public base::DelegateSimpleThread::Delegate,
       public base::RefCountedThreadSafe<AudioDevice> {
  public:
-  class RenderCallback {
+  class CONTENT_EXPORT RenderCallback {
    public:
     virtual void Render(const std::vector<float*>& audio_data,
                         size_t number_of_frames,
                         size_t audio_delay_milliseconds) = 0;
    protected:
     virtual ~RenderCallback() {}
   };
 
   // Methods called on main render thread -------------------------------------
 
@@ skipping 125 matching lines @@
 
   // Protects lifetime of:
   // socket_handle_
   // audio_thread_
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDevice);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_DEVICE_H_