NULL -> nullptr under athena/

athena/content/chrome/web_activity_helpers_browsertest.cc

 // Copyright 2014 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 "athena/activity/public/activity.h"
 #include "athena/test/chrome/athena_browsertest.h"
 #include "athena/test/chrome/test_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 32 matching lines @@
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) override {
     DCHECK_EQ(content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,
               type);
 
     // Assume that all of the WebActivity helpers were created if the
     // extensions::TabHelper was created.
     content::WebContents* web_contents =
         content::Source<content::WebContents>(source).ptr();
     helpers_created_prior_to_render_view_ &=
-        (extensions::TabHelper::FromWebContents(web_contents) != NULL);
+        (extensions::TabHelper::FromWebContents(web_contents) != nullptr);
   }
 
   bool helpers_created_prior_to_render_view_;
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(HelpersCreatedChecker);
 };
 
 typedef AthenaBrowserTest WebActivityHelpersBrowserTest;
 
@@ skipping 19 matching lines @@
   activity->SetCurrentState(Activity::ACTIVITY_UNLOADED);
   activity->SetCurrentState(Activity::ACTIVITY_VISIBLE);
 
   content::WebContents* web_contents2 = activity->GetWebContents();
   EXPECT_NE(web_contents1, web_contents2);
   EXPECT_TRUE(web_contents2->GetRenderViewHost()->IsRenderViewLive());
   EXPECT_TRUE(checker.HelpersCreatedPriorToRenderView());
 }
 
 }  // namespace athena