content_browsertests will now use fake webrtc devices.

content/test/content_test_launcher.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/public/test/test_launcher.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/test/test_suite.h"
+#include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/public/app/content_main.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/content_test_suite_base.h"
 #include "content/shell/shell_content_browser_client.h"
 #include "content/shell/shell_content_client.h"
 #include "content/shell/shell_main_delegate.h"
 #include "content/shell/shell_switches.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_WIN)
@@ skipping 105 matching lines @@
     return true;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentTestLauncherDelegate);
 };
 
 }  // namespace content
 
 int main(int argc, char** argv) {
+  // Always use fake WebRTC devices in this binary since we want to be able
+  // to test WebRTC even if we don't have any devices on the system.
+  media_stream::MediaStreamManager::AlwaysUseFakeDevice();
+
   content::ContentTestLauncherDelegate launcher_delegate;
   return test_launcher::LaunchTests(&launcher_delegate, argc, argv);
 }