Annotates functions returning retained objects.

ios/chrome/browser/signin/gaia_auth_fetcher_ios_private.h

 // Copyright 2015 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 IOS_CHROME_BROWSER_SIGNIN_GAIA_AUTH_FETCHER_IOS_PRIVATE_H_
 #define IOS_CHROME_BROWSER_SIGNIN_GAIA_AUTH_FETCHER_IOS_PRIVATE_H_
 
 #import <WebKit/WebKit.h>
 
 #import "base/mac/scoped_nsobject.h"
@@ skipping 66 matching lines @@
   // Fetches the pending request if it exists.
   void FetchPendingRequest();
   // Finishes the pending request and cleans up its associated state. Returns
   // the URL of the request.
   GURL FinishPendingRequest();
 
   // Returns the cached WKWebView if it exists, or creates one if necessary.
   // Can return nil if the browser state is not active.
   WKWebView* GetWKWebView();
   // Actually creates a WKWebView. Virtual for testing.
-  virtual WKWebView* CreateWKWebView();
+  virtual WKWebView* CreateWKWebView() NS_RETURNS_RETAINED;
   // Stops any page loading in the WKWebView currently in use and releases it.
   void ResetWKWebView();
 
   // ActiveStateManager::Observer implementation.
   void OnActive() override;
   void OnInactive() override;
 
   // Browser state associated with the bridge, used to create WKWebViews.
   web::BrowserState* browser_state_;
   // Fetcher owning this bridge.
   GaiaAuthFetcherIOS* fetcher_;
   // Request currently processed by the bridge.
   Request request_;
   // Navigation delegate of |web_view_| that informs the bridge of relevant
   // navigation events.
   base::scoped_nsobject<GaiaAuthFetcherNavigationDelegate> navigation_delegate_;
   // Web view used to do the network requests.
   base::scoped_nsobject<WKWebView> web_view_;
 
   DISALLOW_COPY_AND_ASSIGN(GaiaAuthFetcherIOSBridge);
 };
 
 #endif  // IOS_CHROME_BROWSER_SIGNIN_GAIA_AUTH_FETCHER_IOS_PRIVATE_H_