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

chrome/browser/notifications/login_state_notification_blocker_chromeos.h

 // Copyright 2013 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_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_
 #define CHROME_BROWSER_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_
 
-#include "ash/shell_observer.h"
+#include "ash/common/shell_observer.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/ui/user_adding_screen.h"
 #include "chromeos/login/login_state.h"
 #include "ui/message_center/notification_blocker.h"
 
 // A notification blocker which checks screen lock / login state for ChromeOS.
 // This is different from ScreenLockNotificationBlocker because:
 //  - ScreenLockNotificationBlocker only cares about lock status but ChromeOS
 //    needs to care about login-screen.
 //  - ScreenLockNotificationBlocker needs a timer to check the screen lock state
@@ skipping 25 matching lines @@
   void OnUserAddingStarted() override;
   void OnUserAddingFinished() override;
 
   bool locked_;
   bool observing_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginStateNotificationBlockerChromeOS);
 };
 
 #endif  // CHROME_BROWSER_NOTIFICATIONS_LOGIN_STATE_NOTIFICATION_BLOCKER_CHROMEOS_H_