Standardize usage of virtual/override/final in extensions/

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
index cf35b5c88811f8272a80a0bde1bcce7846b89748..d788cb540d92895692a1ab0a14f25597d1ce5108 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
@@ -25,46 +25,45 @@ class MimeHandlerViewGuest : public GuestView<MimeHandlerViewGuest>,
   static const char Type[];
 
   // ExtensionFunctionDispatcher::Delegate implementation.
-  virtual WindowController* GetExtensionWindowController() const override;
-  virtual content::WebContents* GetAssociatedWebContents() const override;
+  WindowController* GetExtensionWindowController() const override;
+  content::WebContents* GetAssociatedWebContents() const override;
 
   // GuestViewBase implementation.
-  virtual const char* GetAPINamespace() const override;
-  virtual int GetTaskPrefix() const override;
-  virtual void CreateWebContents(
-      const std::string& embedder_extension_id,
-      int embedder_render_process_id,
-      const GURL& embedder_site_url,
-      const base::DictionaryValue& create_params,
-      const WebContentsCreatedCallback& callback) override;
-  virtual void DidAttachToEmbedder() override;
-  virtual void DidInitialize() override;
+  const char* GetAPINamespace() const override;
+  int GetTaskPrefix() const override;
+  void CreateWebContents(const std::string& embedder_extension_id,
+                         int embedder_render_process_id,
+                         const GURL& embedder_site_url,
+                         const base::DictionaryValue& create_params,
+                         const WebContentsCreatedCallback& callback) override;
+  void DidAttachToEmbedder() override;
+  void DidInitialize() override;
 
   // content::BrowserPluginGuestDelegate implementation
-  virtual bool Find(int request_id,
-                    const base::string16& search_text,
-                    const blink::WebFindOptions& options,
-                    bool is_full_page_plugin) override;
+  bool Find(int request_id,
+            const base::string16& search_text,
+            const blink::WebFindOptions& options,
+            bool is_full_page_plugin) override;
 
   // WebContentsDelegate implementation.
-  virtual void ContentsZoomChange(bool zoom_in) override;
-  virtual void HandleKeyboardEvent(
+  void ContentsZoomChange(bool zoom_in) override;
+  void HandleKeyboardEvent(
       content::WebContents* source,
       const content::NativeWebKeyboardEvent& event) override;
-  virtual void FindReply(content::WebContents* web_contents,
-                         int request_id,
-                         int number_of_matches,
-                         const gfx::Rect& selection_rect,
-                         int active_match_ordinal,
-                         bool final_update) override;
+  void FindReply(content::WebContents* web_contents,
+                 int request_id,
+                 int number_of_matches,
+                 const gfx::Rect& selection_rect,
+                 int active_match_ordinal,
+                 bool final_update) override;
 
   // content::WebContentsObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   MimeHandlerViewGuest(content::BrowserContext* browser_context,
                        int guest_instance_id);
-  virtual ~MimeHandlerViewGuest();
+  ~MimeHandlerViewGuest() override;
 
   void OnRequest(const ExtensionHostMsg_Request_Params& params);