Revert of Hook up ProximityAuthSystem in EasyUnlockService.

components/proximity_auth/screenlock_bridge.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 COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_
 #define COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 138 matching lines @@
     virtual void OnFocusedUserChanged(const std::string& user_id) = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
   static ScreenlockBridge* Get();
 
   void SetLockHandler(LockHandler* lock_handler);
   void SetFocusedUser(const std::string& user_id);
-  std::string GetFocusedUser();
 
   bool IsLocked() const;
   void Lock();
 
   // Unlocks the screen for the authenticated user with the given |user_email|.
   void Unlock(const std::string& user_email);
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
@@ skipping 13 matching lines @@
   // The last focused user's id.
   std::string focused_user_id_;
   base::ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockBridge);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_SCREENLOCK_BRIDGE_H_