Update {virtual,override,final} to follow C++11 style.

content/browser/android/web_contents_observer_android.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 CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_ANDROID_H_
 
 #include <jni.h>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/basictypes.h"
 #include "base/process/kill.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/frame_navigate_params.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class RenderViewHost;
 class WebContents;
 
 // Extends WebContentsObserver for providing a public Java API for some of the
 // the calls it receives.
 class WebContentsObserverAndroid : public WebContentsObserver {
  public:
   WebContentsObserverAndroid(JNIEnv* env,
                              jobject obj,
                              WebContents* web_contents);
-  virtual ~WebContentsObserverAndroid();
+  ~WebContentsObserverAndroid() override;
 
   void Destroy(JNIEnv* env, jobject obj);
 
  private:
   void RenderViewReady() override;
   void RenderProcessGone(base::TerminationStatus termination_status) override;
   void DidStartLoading(RenderViewHost* render_view_host) override;
   void DidStopLoading(RenderViewHost* render_view_host) override;
   void DidFailProvisionalLoad(RenderFrameHost* render_frame_host,
                               const GURL& validated_url,
@@ skipping 39 matching lines @@
 
   JavaObjectWeakGlobalRef weak_java_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserverAndroid);
 };
 
 bool RegisterWebContentsObserverAndroid(JNIEnv* env);
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_WEB_CONTENTS_OBSERVER_ANDROID_H_