Switching AudioOutputAuthorizationHandler from using AudioManager interface to AudioSystem one.

BUG=672468
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2692203003
Cr-Commit-Position: refs/heads/master@{#450939}
bool AudioRendererHost::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(AudioRendererHost, message)
    IPC_MESSAGE_HANDLER(AudioHostMsg_RequestDeviceAuthorization,
                        OnRequestDeviceAuthorization)
    IPC_MESSAGE_HANDLER(AudioHostMsg_CreateStream, OnCreateStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_PlayStream, OnPlayStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_PauseStream, OnPauseStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_CloseStream, OnCloseStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_SetVolume, OnSetVolume)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()

  return handled;
}

bool AudioRendererHost::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(AudioRendererHost, message)
    IPC_MESSAGE_HANDLER(AudioHostMsg_RequestDeviceAuthorization,
                        OnRequestDeviceAuthorization)
    IPC_MESSAGE_HANDLER(AudioHostMsg_CreateStream, OnCreateStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_PlayStream, OnPlayStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_PauseStream, OnPauseStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_CloseStream, OnCloseStream)
    IPC_MESSAGE_HANDLER(AudioHostMsg_SetVolume, OnSetVolume)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()

  return handled;
}
