media: Cleanup class/struct forward declarations

content/browser/media/capture/web_contents_audio_input_stream_unittest.cc

 // Copyright (c) 2013 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.
 
 #include "content/browser/media/capture/web_contents_audio_input_stream.h"
 
 #include <stdint.h>
 
 #include <list>
 #include <memory>
@@ skipping 25 matching lines @@
 using ::testing::SaveArg;
 using ::testing::WithArgs;
 
 using media::AudioBus;
 using media::AudioInputStream;
 using media::AudioOutputStream;
 using media::AudioParameters;
 using media::AudioPushSink;
 using media::SineWaveAudioSource;
 using media::VirtualAudioInputStream;
-using media::VirtualAudioOutputStream;
 
 namespace content {
 
 namespace {
 
 const int kRenderProcessId = 123;
 const int kRenderFrameId = 456;
 const int kAnotherRenderProcessId = 789;
 const int kAnotherRenderFrameId = 1;
 
@@ skipping 483 matching lines @@
   WaitForData();
   RUN_ON_AUDIO_THREAD(ChangeMirroringTarget);
   RUN_ON_AUDIO_THREAD(RemoveOneInputInFIFOOrder);
   RUN_ON_AUDIO_THREAD(Stop);
   RUN_ON_AUDIO_THREAD(Close);
 }
 
 INSTANTIATE_TEST_CASE_P(, WebContentsAudioInputStreamTest, ::testing::Bool());
 
 }  // namespace content