base: Add three helper functions to Values API.

chrome/browser/extensions/extension_cookies_api.cc

 // Copyright (c) 2011 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.
 
 // Implements the Chrome Extensions Cookies API.
 
 #include "chrome/browser/extensions/extension_cookies_api.h"
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
@@ skipping 216 matching lines @@
     // earliest creation time).
     if (it->Name() == name_) {
       result_.reset(
           extension_cookies_helpers::CreateCookieValue(*it, store_id_));
       break;
     }
   }
 
   // The cookie doesn't exist; return null.
   if (it == cookie_list.end())
-    result_.reset(Value::CreateNullValue());
+    result_.reset(base::NullValue());
 
   bool rv = BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this, &GetCookieFunction::RespondOnUIThread));
   DCHECK(rv);
 }
 
 void GetCookieFunction::RespondOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   SendResponse(true);
@@ skipping 284 matching lines @@
         extension_cookies_helpers::CreateCookieStoreValue(
             incognito_profile, incognito_tab_ids.release()));
   }
   result_.reset(cookie_store_list);
   return true;
 }
 
 void GetAllCookieStoresFunction::Run() {
   SendResponse(RunImpl());
 }