Whitelist Google Hangouts origins to access Screen Capture API.

content/browser/renderer_host/media/video_capture_manager.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/browser/renderer_host/media/video_capture_manager.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 162 matching lines @@
         break;
       }
       case MEDIA_TAB_VIDEO_CAPTURE: {
         video_capture_device = WebContentsVideoCaptureDevice::Create(
             vc_device_name.unique_id, base::Closure());
         break;
       }
       case MEDIA_SCREEN_VIDEO_CAPTURE: {
 #if (defined(OS_LINUX) && defined(USE_X11)) || \
     defined(OS_MACOSX) || defined(OS_WIN)
-        CHECK(CommandLine::ForCurrentProcess()->HasSwitch(
-                switches::kEnableUserMediaScreenCapturing));
         scoped_refptr<base::SequencedWorkerPool> blocking_pool =
             BrowserThread::GetBlockingPool();
         video_capture_device = new media::ScreenCaptureDevice(
             blocking_pool->GetSequencedTaskRunner(
                 blocking_pool->GetSequenceToken()));
 #endif  // defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
         break;
       }
       default: {
         NOTIMPLEMENTED();
@@ skipping 358 matching lines @@
 
     VideoCaptureDevices::iterator dit = devices_.find(capture_session_id);
     if (dit != devices_.end()) {
       return dit->second.capture_device;
     }
   }
   return NULL;
 }
 
 }  // namespace content