Fix the output device selection introduced by 163343002.

It corrects a mistake which does not assign the output device id to the member of the dispatcher.

NOTRY=true

BUG=344818
TEST=http://localhost:8080/hangout_services_test.html works with device selection.
R=joi@chromium.org

Review URL: https://codereview.chromium.org/172243003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252025 0039d316-1c4b-4281-b951-d872f2087c98

media/audio/audio_manager_base.cc

@@ -39,7 +39,8 @@ struct AudioManagerBase::DispatcherParams {
                    const AudioParameters& output,
                    const std::string& output_device_id)
       : input_params(input),
-        output_params(output) {}
+        output_params(output),
+        output_device_id(output_device_id) {}
   ~DispatcherParams() {}
 
   const AudioParameters input_params;