Standardize usage of virtual/override/final in chrome/browser/task_manager/

chrome/browser/task_manager/guest_information.h

Index: chrome/browser/task_manager/guest_information.h
diff --git a/chrome/browser/task_manager/guest_information.h b/chrome/browser/task_manager/guest_information.h
index d55709e091f1dc642331e3cfd53ec42a0d96a59d..63339788afac924ec730c6424d150e43585742dd 100644
--- a/chrome/browser/task_manager/guest_information.h
+++ b/chrome/browser/task_manager/guest_information.h
@@ -16,12 +16,12 @@ class GuestResource;
 class GuestInformation : public NotificationObservingWebContentsInformation {
  public:
   GuestInformation();
-  virtual ~GuestInformation();
+  ~GuestInformation() override;
 
   // WebContentsInformation implementation.
-  virtual bool CheckOwnership(content::WebContents* web_contents) override;
-  virtual void GetAll(const NewWebContentsCallback& callback) override;
-  virtual scoped_ptr<RendererResource> MakeResource(
+  bool CheckOwnership(content::WebContents* web_contents) override;
+  void GetAll(const NewWebContentsCallback& callback) override;
+  scoped_ptr<RendererResource> MakeResource(
       content::WebContents* web_contents) override;
 
  private: