Remove base::Value::CreateNullValue

chrome/browser/extensions/api/cookies/cookies_api.cc

 // Copyright (c) 2012 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/api/cookies/cookies_api.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
+#include "base/memory/ptr_util.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/cookies/cookies_api_constants.h"
 #include "chrome/browser/extensions/api/cookies/cookies_helpers.h"
 #include "chrome/browser/extensions/chrome_extension_function_details.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/common/extensions/api/cookies.h"
@@ skipping 225 matching lines @@
     if (cookie.Name() == parsed_args_->details.name) {
       cookies::Cookie api_cookie = cookies_helpers::CreateCookie(
           cookie, *parsed_args_->details.store_id);
       results_ = Get::Results::Create(api_cookie);
       break;
     }
   }
 
   // The cookie doesn't exist; return null.
   if (!results_)
-    SetResult(base::Value::CreateNullValue());
+    SetResult(base::MakeUnique<base::Value>());
 
   bool rv = BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&CookiesGetFunction::RespondOnUIThread, this));
   DCHECK(rv);
 }
 
 void CookiesGetFunction::RespondOnUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   SendResponse(true);
@@ skipping 315 matching lines @@
 BrowserContextKeyedAPIFactory<CookiesAPI>* CookiesAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 void CookiesAPI::OnListenerAdded(const EventListenerInfo& details) {
   cookies_event_router_.reset(new CookiesEventRouter(browser_context_));
   EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 }  // namespace extensions