Revert "chromeos: Move files in //ash/common to //ash, part 3"

chrome/browser/chromeos/policy/display_rotation_default_handler.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_DISPLAY_ROTATION_DEFAULT_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DISPLAY_ROTATION_DEFAULT_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 
+#include "ash/common/shell_observer.h"
 #include "ash/display/window_tree_host_manager.h"
-#include "ash/shell_observer.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "ui/display/display.h"
 
 namespace policy {
 
 // Enforces the device policy DisplayRotationDefault.
 // This class is created in ChromeShellDelegate::PreInit() and registers
 // itself with WindowTreeHostManager as Observer for display changes, and
 // with CrosSettings as Observer for setting changes. Whenever there is a change
@@ skipping 38 matching lines @@
 
   std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
       settings_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayRotationDefaultHandler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DISPLAY_ROTATION_DEFAULT_HANDLER_H_