chromeos: Move files in //ash/common to //ash, part 2

ash/system/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/system/audio/tray_audio.h"
 
-#include "ash/common/test/ash_test.h"
 #include "ash/system/tray/system_tray.h"
+#include "ash/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