Remove bogus DCHECK in content::UserMediaClientImpl and update unit test

content/renderer/media/user_media_client_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/media/user_media_client_impl.h"
 
 #include <stddef.h>
 
 #include <utility>
 #include <vector>
@@ skipping 735 matching lines @@
 
   DeleteUserMediaRequestInfo(request);
 }
 
 void UserMediaClientImpl::OnDevicesEnumerated(
     int request_id,
     const StreamDeviceInfoArray& device_array) {
   DVLOG(1) << "UserMediaClientImpl::OnDevicesEnumerated(" << request_id << ")";
 
   MediaDevicesRequestInfo* request = FindMediaDevicesRequestInfo(request_id);
-  DCHECK(request);
+  if (!request)
+    return;
 
   if (request_id == request->audio_input_request_id) {
     request->has_audio_input_returned = true;
     request->audio_input_devices = device_array;
   } else if (request_id == request->video_input_request_id) {
     request->has_video_input_returned = true;
     request->video_input_devices = device_array;
   } else {
     DCHECK_EQ(request->audio_output_request_id, request_id);
     request->has_audio_output_returned = true;
@@ skipping 412 matching lines @@
       return;
     }
   }
 }
 
 bool UserMediaClientImpl::UserMediaRequestInfo::HasPendingSources() const {
   return !sources_waiting_for_callback_.empty();
 }
 
 }  // namespace content