Standardize usage of virtual/override/final in extensions/

extensions/browser/guest_view/guest_view_base.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 "extensions/browser/guest_view/guest_view_base.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 47 matching lines @@
 // This observer ensures that the GuestViewBase destroys itself when its
 // embedder goes away.
 class GuestViewBase::EmbedderLifetimeObserver : public WebContentsObserver {
  public:
   EmbedderLifetimeObserver(GuestViewBase* guest,
                            content::WebContents* embedder_web_contents)
       : WebContentsObserver(embedder_web_contents),
         destroyed_(false),
         guest_(guest) {}
 
-  virtual ~EmbedderLifetimeObserver() {}
+  ~EmbedderLifetimeObserver() override {}
 
   // WebContentsObserver implementation.
-  virtual void WebContentsDestroyed() override {
+  void WebContentsDestroyed() override {
     // If the embedder is destroyed then destroy the guest.
     Destroy();
   }
 
-  virtual void AboutToNavigateRenderView(
+  void AboutToNavigateRenderView(
       content::RenderViewHost* render_view_host) override {
     // If the embedder navigates then destroy the guest.
     Destroy();
   }
 
-  virtual void RenderProcessGone(base::TerminationStatus status) override {
+  void RenderProcessGone(base::TerminationStatus status) override {
     // If the embedder crashes, then destroy the guest.
     Destroy();
   }
 
  private:
   bool destroyed_;
   GuestViewBase* guest_;
 
   void Destroy() {
     if (destroyed_)
@@ skipping 400 matching lines @@
 
 // static
 void GuestViewBase::RegisterGuestViewTypes() {
   AppViewGuest::Register();
   ExtensionOptionsGuest::Register();
   MimeHandlerViewGuest::Register();
   WebViewGuest::Register();
 }
 
 }  // namespace extensions