Clean up forward declarations in Source/modules

Source/modules/webaudio/AudioBasicProcessorNode.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AudioBasicProcessorNode_h
 #define AudioBasicProcessorNode_h
 
 #include "modules/webaudio/AudioNode.h"
-#include "wtf/Forward.h"
-#include "wtf/Threading.h"
 
 namespace blink {
 
-class AudioBus;
 class AudioNodeInput;
 class AudioProcessor;
 
 // AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels.
 class AudioBasicProcessorNode : public AudioNode {
 public:
     AudioBasicProcessorNode(AudioContext*, float sampleRate);
     virtual ~AudioBasicProcessorNode();
     virtual void trace(Visitor*) override;
 
@@ skipping 14 matching lines @@
     virtual double tailTime() const override final;
     virtual double latencyTime() const override final;
 
     AudioProcessor* processor() { return m_processor.get(); }
     Member<AudioProcessor> m_processor;
 };
 
 } // namespace blink
 
 #endif // AudioBasicProcessorNode_h