Plumb |input_channels| all the way to AudioManager

media/audio/audio_output_ipc.h

Index: media/audio/audio_output_ipc.h
===================================================================
--- media/audio/audio_output_ipc.h	(revision 181072)
+++ media/audio/audio_output_ipc.h	(working copy)
@@ -68,13 +68,12 @@
 
   // Sends a request to create an AudioOutputController object in the peer
   // process, identify it by |stream_id| and configure it to use the specified
-  // audio |params| and number of synchronized input channels.
+  // audio |params| including number of synchronized input channels.
   // Once the stream has been created, the implementation must
   // generate a notification to the AudioOutputIPCDelegate and call
   // OnStreamCreated().
   virtual void CreateStream(int stream_id,
-                            const AudioParameters& params,
-                            int input_channels) = 0;
+                            const AudioParameters& params) = 0;
 
   // Starts playing the stream.  This should generate a call to
   // AudioOutputController::Play().