mash: Move MultiProfileMediaTrayItem to ash/common.

ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc

Index: ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc
diff --git a/ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc b/ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc
index 15072c7ae61daf1ae1205299d72a29c126a8df78..336c89ca407cc9dd9becce19196b7f3481d2d887 100644
--- a/ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc
+++ b/ash/system/chromeos/media_security/multi_profile_media_tray_item_unittest.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/system/chromeos/media_security/multi_profile_media_tray_item.h"
+#include "ash/common/system/chromeos/media_security/multi_profile_media_tray_item.h"
 
 #include "ash/common/ash_view_ids.h"
 #include "ash/common/system/tray/system_tray_bubble.h"
@@ -18,7 +18,7 @@
 
 namespace ash {
 
-typedef test::AshTestBase MultiProfileMediaTrayItemTest;
+using MultiProfileMediaTrayItemTest = test::AshTestBase;
 
 TEST_F(MultiProfileMediaTrayItemTest, NotifyMediaCaptureChange) {
   TrayItemView::DisableAnimationsForTest();