[Smart Lock] Extract the screenlock state to the proximity_auth component.

chrome/browser/signin/easy_unlock_service_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_OBSERVER_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_OBSERVER_H_
 
-#include "chrome/browser/signin/easy_unlock_screenlock_state_handler.h"
+#include "components/proximity_auth/screenlock_state.h"
 
 class EasyUnlockServiceObserver {
  public:
   // Invoked when turn-off operation status changes.
   virtual void OnTurnOffOperationStatusChanged() {}
 
   // Invoked when screenlock state changes.
   virtual void OnScreenlockStateChanged(
-      EasyUnlockScreenlockStateHandler::State state) {}
+      proximity_auth::ScreenlockState state) {}
 
  protected:
   virtual ~EasyUnlockServiceObserver() {}
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_OBSERVER_H_