C++11 override style change for athena

athena/content/chrome/web_activity_helpers_browsertest.cc

Index: athena/content/chrome/web_activity_helpers_browsertest.cc
diff --git a/athena/content/chrome/web_activity_helpers_browsertest.cc b/athena/content/chrome/web_activity_helpers_browsertest.cc
index 12c79d26df107b886a0fcead8473427b86b959ce..90a6dbd3f5450de53849f30c93fc2a9c15683aae 100644
--- a/athena/content/chrome/web_activity_helpers_browsertest.cc
+++ b/athena/content/chrome/web_activity_helpers_browsertest.cc
@@ -28,7 +28,7 @@ class HelpersCreatedChecker : public content::NotificationObserver {
                    content::NotificationService::AllSources());
   }
 
-  virtual ~HelpersCreatedChecker() {
+  ~HelpersCreatedChecker() override {
   }
 
   // Returns true if WebActivity helpers were attached to the WebContents prior
@@ -39,7 +39,7 @@ class HelpersCreatedChecker : public content::NotificationObserver {
 
  private:
   // content::NotificationObserver:
-  virtual void Observe(int type,
+  void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) override {
     DCHECK_EQ(content::NOTIFICATION_WEB_CONTENTS_RENDER_VIEW_HOST_CREATED,