chrome: Cleanup class/struct forward declarations

chrome/browser/signin/easy_unlock_service.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_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 24 matching lines @@
 
 namespace user_manager {
 class User;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace proximity_auth {
-class ProximityAuthBleSystem;
 class ProximityAuthSystem;
 }
 
 class EasyUnlockAppManager;
 class EasyUnlockServiceObserver;
 class Profile;
 class PrefRegistrySimple;
 
 class EasyUnlockService : public KeyedService {
  public:
@@ skipping 319 matching lines @@
   bool tpm_key_checked_;
 
   base::ObserverList<EasyUnlockServiceObserver> observers_;
 
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_