Remove bogus DCHECKs in enumeration processing.

content/renderer/media/user_media_client_impl.cc

Index: content/renderer/media/user_media_client_impl.cc
diff --git a/content/renderer/media/user_media_client_impl.cc b/content/renderer/media/user_media_client_impl.cc
index 62dca219828b9e88036beea4d0dbb26b5003caf6..21431ec4c6121a0c67583d71b59d84f34f5a7d5e 100644
--- a/content/renderer/media/user_media_client_impl.cc
+++ b/content/renderer/media/user_media_client_impl.cc
@@ -727,16 +727,13 @@ void UserMediaClientImpl::OnDevicesEnumerated(
 
   if (request_id == request->audio_input_request_id) {
     request->has_audio_input_returned = true;
-    DCHECK(request->audio_input_devices.empty());
     request->audio_input_devices = device_array;
   } else if (request_id == request->video_input_request_id) {
     request->has_video_input_returned = true;
-    DCHECK(request->video_input_devices.empty());
     request->video_input_devices = device_array;
   } else {
     DCHECK_EQ(request->audio_output_request_id, request_id);
     request->has_audio_output_returned = true;
-    DCHECK(request->audio_output_devices.empty());
     request->audio_output_devices = device_array;
   }