[ObjC ARC] Converts components/signin/ios/browser:browser to ARC.

components/signin/ios/browser/oauth2_token_service_observer_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_SIGNIN_IOS_BROWSER_OAUTH2_TOKEN_SERVICE_OBSERVER_BRIDGE_H_
 #define COMPONENTS_SIGNIN_IOS_BROWSER_OAUTH2_TOKEN_SERVICE_OBSERVER_BRIDGE_H_
 
 #import <Foundation/Foundation.h>
 
+#import "base/ios/weak_nsobject.h"
 #include "base/macros.h"
 #include "google_apis/gaia/oauth2_token_service.h"
 
 @protocol OAuth2TokenServiceObserverBridgeDelegate <NSObject>
 
 @optional
 
 // Informs the delegate that a refresh token is avaible for |account_id|.
 - (void)onRefreshTokenAvailable:(const std::string&)account_id;
 
@@ skipping 22 matching lines @@
 
   // OAuth2TokenService::Observer
   void OnRefreshTokenAvailable(const std::string& account_id) override;
   void OnRefreshTokenRevoked(const std::string& account_id) override;
   void OnRefreshTokensLoaded() override;
   void OnStartBatchChanges() override;
   void OnEndBatchChanges() override;
 
  private:
   OAuth2TokenService* token_service_;  // weak
-  id<OAuth2TokenServiceObserverBridgeDelegate> delegate_;
+  base::WeakNSProtocol<id<OAuth2TokenServiceObserverBridgeDelegate>> delegate_;

[msarda, 2017/06/13 13:15:30]

I do not know that much about ARC transition, so this is probably a newbie
question: Shouldn't this be __weak (or maybe a weak property) instead of
base::WeakNSProtocol?

[marq (ping after 24h), 2017/06/15 09:27:33]

This header is included in non-arc targets, so it has to stay a WeakNSProtocol.

 
   DISALLOW_COPY_AND_ASSIGN(OAuth2TokenServiceObserverBridge);
 };
 
 #endif  // COMPONENTS_SIGNIN_IOS_BROWSER_OAUTH2_TOKEN_SERVICE_OBSERVER_BRIDGE_H_