Implement getMediaDevices.

content/browser/renderer_host/media/device_request_message_filter.cc

Index: content/browser/renderer_host/media/device_request_message_filter.cc
diff --git a/content/browser/renderer_host/media/device_request_message_filter.cc b/content/browser/renderer_host/media/device_request_message_filter.cc
index 4aaf2398d5593685ee4bf9501f928bfbe16d5876..ad71a0ca203eae96552043afa30cbe0bcbf9e349 100644
--- a/content/browser/renderer_host/media/device_request_message_filter.cc
+++ b/content/browser/renderer_host/media/device_request_message_filter.cc
@@ -111,8 +111,6 @@ void DeviceRequestMessageFilter::DevicesEnumerated(
 
   Send(new MediaStreamMsg_GetSourcesACK(request_it->request_id, all_devices));
 
-  media_stream_manager_->CancelRequest(request_it->audio_devices_label);
-  media_stream_manager_->CancelRequest(request_it->video_devices_label);
   requests_.erase(request_it);
 }
 
@@ -147,13 +145,15 @@ void DeviceRequestMessageFilter::OnGetSources(int request_id,
   // Make request to get audio devices.
   const std::string& audio_label = media_stream_manager_->EnumerateDevices(
       this, -1, -1, resource_context_->GetMediaDeviceIDSalt(), -1,
-      MEDIA_DEVICE_AUDIO_CAPTURE, security_origin);
+      MEDIA_DEVICE_AUDIO_CAPTURE, security_origin,
+      resource_context_->AllowMicAccess(security_origin));
   DCHECK(!audio_label.empty());
 
   // Make request for video devices.
   const std::string& video_label = media_stream_manager_->EnumerateDevices(
       this, -1, -1, resource_context_->GetMediaDeviceIDSalt(), -1,
-      MEDIA_DEVICE_VIDEO_CAPTURE, security_origin);
+      MEDIA_DEVICE_VIDEO_CAPTURE, security_origin,
+      resource_context_->AllowCameraAccess(security_origin));
   DCHECK(!video_label.empty());
 
   requests_.push_back(DeviceRequest(