Annotates functions returning retained objects.

components/signin/ios/browser/account_consistency_service.mm

 // 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.
 
 #include "components/signin/ios/browser/account_consistency_service.h"
 
 #include <WebKit/WebKit.h>
 
 #import "base/ios/weak_nsobject.h"
 #include "base/logging.h"
@@ skipping 382 matching lines @@
     web_view_.reset(CreateWKWebView());
     navigation_delegate_.reset([[AccountConsistencyNavigationDelegate alloc]
         initWithCallback:base::Bind(&AccountConsistencyService::
                                         FinishedApplyingCookieRequest,
                                     base::Unretained(this), true)]);
     [web_view_ setNavigationDelegate:navigation_delegate_];
   }
   return web_view_.get();
 }
 
-WKWebView* AccountConsistencyService::CreateWKWebView() {
+WKWebView* AccountConsistencyService::CreateWKWebView() NS_RETURNS_RETAINED {
   return web::CreateWKWebView(CGRectZero, browser_state_);
 }
 
 void AccountConsistencyService::ResetWKWebView() {
   [web_view_ setNavigationDelegate:nil];
   [web_view_ stopLoading];
   web_view_.reset();
   navigation_delegate_.reset();
   applying_cookie_requests_ = false;
 }
@@ skipping 59 matching lines @@
   // |browser_state_| is now active. There might be some pending cookie requests
   // to apply.
   ApplyCookieRequests();
 }
 
 void AccountConsistencyService::OnInactive() {
   // |browser_state_| is now inactive. Stop using |web_view_| and don't create
   // a new one until it is active.
   ResetWKWebView();
 }