Revert of Revert of Clean up Smart Lock cryptohome keys logic:

chrome/browser/signin/easy_unlock_service_signin_chromeos.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_SIGNIN_CHROMEOS_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_SIGNIN_CHROMEOS_H_
 
 #include <map>
 #include <string>
 
@@ skipping 46 matching lines @@
 
   // EasyUnlockService implementation:
   virtual EasyUnlockService::Type GetType() const override;
   virtual std::string GetUserEmail() const override;
   virtual void LaunchSetup() override;
   virtual const base::DictionaryValue* GetPermitAccess() const override;
   virtual void SetPermitAccess(const base::DictionaryValue& permit) override;
   virtual void ClearPermitAccess() override;
   virtual const base::ListValue* GetRemoteDevices() const override;
   virtual void SetRemoteDevices(const base::ListValue& devices) override;
-  virtual void ClearRemoteDevices() override;
   virtual void RunTurnOffFlow() override;
   virtual void ResetTurnOffFlow() override;
   virtual TurnOffFlowStatus GetTurnOffFlowStatus() const override;
   virtual std::string GetChallenge() const override;
   virtual std::string GetWrappedSecret() const override;
   virtual void RecordEasySignInOutcome(const std::string& user_id,
                                        bool success) const override;
   virtual void RecordPasswordLoginEvent(
       const std::string& user_id) const override;
   virtual void InitializeInternal() override;
@@ skipping 37 matching lines @@
   // Whether the service has been successfully initialized, and has not been
   // shut down.
   bool service_active_;
 
   base::WeakPtrFactory<EasyUnlockServiceSignin> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockServiceSignin);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_SIGNIN_CHROMEOS_H_