Make OAuth2TokenService and subclasses take delegate by unique_ptr

components/signin/core/browser/profile_oauth2_token_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 COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
 // the request changes or is cleared.  When the request completes,
 // Consumer::OnGetTokenSuccess will be invoked, but the access token
 // won't be cached.
 //
 // Note: requests should be started from the UI thread. To start a
 // request from other thread, please use OAuth2TokenServiceRequest.
 class ProfileOAuth2TokenService : public OAuth2TokenService,
                                   public OAuth2TokenService::Observer,
                                   public KeyedService {
  public:
-  ProfileOAuth2TokenService(OAuth2TokenServiceDelegate* delegate);
+  ProfileOAuth2TokenService(
+      std::unique_ptr<OAuth2TokenServiceDelegate> delegate);
   ~ProfileOAuth2TokenService() override;
 
   // KeyedService implementation.
   void Shutdown() override;
 
   // Loads credentials from a backing persistent store to make them available
   // after service is used between profile restarts.
   //
   // Only call this method if there is at least one account connected to the
   // profile, otherwise startup will cause unneeded work on the IO thread. The
@@ skipping 15 matching lines @@
   const net::BackoffEntry* GetDelegateBackoffEntry();
 
  private:
   void OnRefreshTokenAvailable(const std::string& account_id) override;
   void OnRefreshTokenRevoked(const std::string& account_id) override;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileOAuth2TokenService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_PROFILE_OAUTH2_TOKEN_SERVICE_H_