remove VideoDeviceError and AudioDeviceError for media stream.

content/renderer/pepper/pepper_device_enumeration_event_handler.cc

Index: content/renderer/pepper/pepper_device_enumeration_event_handler.cc
===================================================================
--- content/renderer/pepper/pepper_device_enumeration_event_handler.cc	(revision 161798)
+++ content/renderer/pepper/pepper_device_enumeration_event_handler.cc	(working copy)
@@ -55,16 +55,6 @@
     int request_id) {
 }
 
-void PepperDeviceEnumerationEventHandler::OnVideoDeviceFailed(
-    const std::string& label,
-    int index) {
-}
-
-void PepperDeviceEnumerationEventHandler::OnAudioDeviceFailed(
-    const std::string& label,
-    int index) {
-}
-
 void PepperDeviceEnumerationEventHandler::OnDevicesEnumerated(
     int request_id,
     const media_stream::StreamDeviceInfoArray& device_array) {