mash: Move StatusTray and StatusAreaWidget to //ash/common

ash/system/chromeos/rotation/tray_rotation_lock.cc

 // Copyright 2014 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/chromeos/rotation/tray_rotation_lock.h"
 
 #include "ash/common/material_design/material_design_controller.h"
+#include "ash/common/system/tray/system_tray.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_item_more.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/shell.h"
-#include "ash/system/tray/system_tray.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/display/display.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
 
 namespace ash {
 
@@ skipping 150 matching lines @@
 }
 
 void TrayRotationLock::StopObservingShell() {
   if (!observing_shell_)
     return;
   WmShell::Get()->RemoveShellObserver(this);
   observing_shell_ = false;
 }
 
 }  // namespace ash