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

chrome/browser/history/history_tab_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 class HistoryService;
 
 namespace history {
 struct HistoryAddPageArgs;
 }
 
 class HistoryTabHelper : public content::WebContentsObserver,
                          public content::WebContentsUserData<HistoryTabHelper> {
  public:
-  virtual ~HistoryTabHelper();
+  ~HistoryTabHelper() override;
 
   // Updates history with the specified navigation. This is called by
   // OnMsgNavigate to update history state.
   void UpdateHistoryForNavigation(
       const history::HistoryAddPageArgs& add_page_args);
 
   // Sends the page title to the history service. This is called when we receive
   // the page title and we know we want to update history.
   void UpdateHistoryPageTitle(const content::NavigationEntry& entry);
 
   // Returns the history::HistoryAddPageArgs to use for adding a page to
   // history.
   history::HistoryAddPageArgs CreateHistoryAddPageArgs(
       const GURL& virtual_url,
       base::Time timestamp,
       bool did_replace_entry,
       const content::FrameNavigateParams& params);
 
  private:
   explicit HistoryTabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<HistoryTabHelper>;
 
   // content::WebContentsObserver implementation.
-  virtual void DidNavigateMainFrame(
+  void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
-  virtual void DidNavigateAnyFrame(
-      content::RenderFrameHost* render_frame_host,
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) override;
-  virtual void TitleWasSet(content::NavigationEntry* entry,
-                           bool explicit_set) override;
-  virtual void WebContentsDestroyed() override;
+  void DidNavigateAnyFrame(content::RenderFrameHost* render_frame_host,
+                           const content::LoadCommittedDetails& details,
+                           const content::FrameNavigateParams& params) override;
+  void TitleWasSet(content::NavigationEntry* entry, bool explicit_set) override;
+  void WebContentsDestroyed() override;
 
   // Helper function to return the history service.  May return NULL.
   HistoryService* GetHistoryService();
 
   // Whether we have a (non-empty) title for the current page.
   // Used to prevent subsequent title updates from affecting history. This
   // prevents some weirdness because some AJAXy apps use titles for status
   // messages.
   bool received_page_title_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryTabHelper);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_TAB_HELPER_H_