Introduce PPB_AudioInput_Dev v0.3 and refactor the device enumeration code:

content/renderer/pepper/pepper_plugin_delegate_impl.cc

 // Copyright (c) 2012 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/renderer/pepper/pepper_plugin_delegate_impl.h"
 
 #include <cmath>
 #include <cstddef>
 #include <map>
 #include <queue>
@@ skipping 1520 matching lines @@
       FROM_HERE,
       base::Bind(
           &PepperDeviceEnumerationEventHandler::OnDevicesEnumerationFailed,
           device_enumeration_event_handler_->AsWeakPtr(), request_id));
 #endif
 
   return request_id;
 }
 
 void PepperPluginDelegateImpl::StopEnumerateDevices(int request_id) {
+  device_enumeration_event_handler_->UnregisterEnumerateDevicesCallback(
+      request_id);
+
 #if defined(ENABLE_WEBRTC)
   // Need to post task since this function might be called inside the callback
   // of EnumerateDevices.
   MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(
           &MediaStreamDispatcher::StopEnumerateDevices,
           render_view_->media_stream_dispatcher()->AsWeakPtr(),
           request_id, device_enumeration_event_handler_.get()->AsWeakPtr()));
 #endif
@@ skipping 256 matching lines @@
     RenderWidgetFullscreenPepper* container =
         static_cast<RenderWidgetFullscreenPepper*>(
             instance->fullscreen_container());
     return container->mouse_lock_dispatcher();
   } else {
     return render_view_->mouse_lock_dispatcher();
   }
 }
 
 }  // namespace content