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

content/renderer/media/renderer_webaudiodevice_impl.cc

Index: content/renderer/media/renderer_webaudiodevice_impl.cc
===================================================================
--- content/renderer/media/renderer_webaudiodevice_impl.cc	(revision 175940)
+++ content/renderer/media/renderer_webaudiodevice_impl.cc	(working copy)
@@ -22,8 +22,10 @@
 
 RendererWebAudioDeviceImpl::RendererWebAudioDeviceImpl(
     const media::AudioParameters& params,
+    unsigned input_channels,
     WebAudioDevice::RenderCallback* callback)
     : params_(params),
+      input_channels_(input_channels),
       client_callback_(callback) {
   DCHECK(client_callback_);
 }
@@ -39,18 +41,8 @@
     return;  // Already started.
 
   output_device_ = AudioDeviceFactory::NewOutputDevice();
+  output_device_->InitializeIO(params_, input_channels_, this);
 
-  // TODO(crogers): remove once we properly handle input device selection.
-  // https://code.google.com/p/chromium/issues/detail?id=147327
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableWebAudioInput)) {
-    // TODO(crogers): support more than hard-coded stereo:
-    // https://code.google.com/p/chromium/issues/detail?id=147326
-    output_device_->InitializeIO(params_, 2, this);
-  } else {
-    output_device_->Initialize(params_, this);
-  }
-
   // Assumption: This method is being invoked within a V8 call stack.  CHECKs
   // will fail in the call to frameForCurrentContext() otherwise.
   //