Code:   AudioOutputAuthorizationHandlerTest() {
    base::CommandLine::ForCurrentProcess()->AppendSwitch(
        switches::kUseFakeDeviceForMediaStream);

    thread_bundle_ = base::MakeUnique<TestBrowserThreadBundle>(
        TestBrowserThreadBundle::Options::REAL_IO_THREAD);
    audio_thread_ = base::MakeUnique<AudioManagerThread>();
     audio_manager_.reset(new media::FakeAudioManager(
         audio_thread_->task_runner(), audio_thread_->worker_task_runner(),
         &log_factory_));
     media_stream_manager_ =
         base::MakeUnique<MediaStreamManager>(audio_manager_.get());
    SyncWithAllThreads();
  }

Vulnerability Type: DoS 
CWE ID: 
Summary: Multiple unspecified vulnerabilities in Google Chrome before 43.0.2357.65 allow attackers to cause a denial of service or possibly have other impact via unknown vectors.
Commit Message: 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}