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}
  void CreateDeviceAssociation(const std::string& input_device_id,
                               const std::string& output_device_id) {
    EXPECT_FALSE(IsValidDeviceId(input_device_id));
    EXPECT_FALSE(IsValidDeviceId(output_device_id));

    associations_[input_device_id] = output_device_id;
  }

  void CreateDeviceAssociation(const std::string& input_device_id,
                               const std::string& output_device_id) {
    EXPECT_FALSE(IsValidDeviceId(input_device_id));
    EXPECT_FALSE(IsValidDeviceId(output_device_id));

    associations_[input_device_id] = output_device_id;
  }
