chromeos: Move files in //ash/common to //ash, part 1

ash/common/system/chromeos/audio/tray_audio_unittest.cc

-// Copyright 2016 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 "ash/common/system/chromeos/audio/tray_audio.h"
-
-#include "ash/common/system/tray/system_tray.h"
-#include "ash/common/test/ash_test.h"
-
-namespace ash {
-
-using TrayAudioTest = AshTest;
-
-// Tests that the volume popup view can be explicitly shown.
-TEST_F(TrayAudioTest, ShowPopUpVolumeView) {
-  TrayAudio* tray_audio = GetPrimarySystemTray()->GetTrayAudio();
-  ASSERT_TRUE(tray_audio);
-
-  // The volume popup is not visible initially.
-  EXPECT_FALSE(tray_audio->volume_view_for_testing());
-  EXPECT_FALSE(tray_audio->pop_up_volume_view_for_testing());
-
-  // Simulate ARC asking to show the volume view.
-  TrayAudio::ShowPopUpVolumeView();
-
-  // Volume view is now visible.
-  EXPECT_TRUE(tray_audio->volume_view_for_testing());
-  EXPECT_TRUE(tray_audio->pop_up_volume_view_for_testing());
-}
-
-}  // namespace ash