Annotates functions returning retained objects.

ios/chrome/browser/signin/gaia_auth_fetcher_ios.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 "ios/chrome/browser/signin/gaia_auth_fetcher_ios.h"
 
 #import <WebKit/WebKit.h>
 
 #include "base/json/string_escape.h"
 #include "base/logging.h"
@@ skipping 278 matching lines @@
   return web_view_.get();
 }
 
 void GaiaAuthFetcherIOSBridge::ResetWKWebView() {
   [web_view_ setNavigationDelegate:nil];
   [web_view_ stopLoading];
   web_view_.reset();
   navigation_delegate_.reset();
 }
 
-WKWebView* GaiaAuthFetcherIOSBridge::CreateWKWebView() {
+WKWebView* GaiaAuthFetcherIOSBridge::CreateWKWebView() NS_RETURNS_RETAINED {
   return web::CreateWKWebView(CGRectZero, browser_state_);
 }
 
 void GaiaAuthFetcherIOSBridge::OnActive() {
   // |browser_state_| is now active. If there is a pending request, restart it.
   FetchPendingRequest();
 }
 
 void GaiaAuthFetcherIOSBridge::OnInactive() {
   // |browser_state_| is now inactive. Stop using |web_view_| and don't create
@@ skipping 64 matching lines @@
 }
 
 void GaiaAuthFetcherIOS::SetShouldUseGaiaAuthFetcherIOSForTesting(
     bool use_gaia_fetcher_ios) {
   g_should_use_gaia_auth_fetcher_ios = use_gaia_fetcher_ios;
 }
 
 bool GaiaAuthFetcherIOS::ShouldUseGaiaAuthFetcherIOS() {
   return g_should_use_gaia_auth_fetcher_ios;
 }