Update RendererWebKitPlatformSupportImpl::createAudioDevice() to handle |input_channels|

content/renderer/media/renderer_webaudiodevice_impl.h

Index: content/renderer/media/renderer_webaudiodevice_impl.h
===================================================================
--- content/renderer/media/renderer_webaudiodevice_impl.h	(revision 176187)
+++ content/renderer/media/renderer_webaudiodevice_impl.h	(working copy)
@@ -21,6 +21,7 @@
       public media::AudioRendererSink::RenderCallback {
  public:
   RendererWebAudioDeviceImpl(const media::AudioParameters& params,
+                             int input_channels,
                              WebKit::WebAudioDevice::RenderCallback* callback);
   virtual ~RendererWebAudioDeviceImpl();
 
@@ -41,6 +42,7 @@
 
  private:
   const media::AudioParameters params_;
+  int input_channels_;
 
   // Weak reference to the callback into WebKit code.
   WebKit::WebAudioDevice::RenderCallback* const client_callback_;