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

android_webview/native/aw_pdf_exporter.h

 // Copyright 2013 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 ANDROID_WEBVIEW_NATIVE_AW_PDF_EXPORTER_H_
 #define ANDROID_WEBVIEW_NATIVE_AW_PDF_EXPORTER_H_
 
 #include <jni.h>
 
 #include "android_webview/browser/renderer_host/print_manager.h"
@@ skipping 12 matching lines @@
 };
 
 namespace android_webview {
 
 class AwPdfExporter : public PrintManagerDelegate {
  public:
   AwPdfExporter(JNIEnv* env,
                 jobject obj,
                 content::WebContents* web_contents);
 
-  virtual ~AwPdfExporter();
+  ~AwPdfExporter() override;
 
   void ExportToPdf(JNIEnv* env,
                    jobject obj,
                    int fd,
                    jobject cancel_signal);
 
   // Implement PrintManagerDelegate methods
-  virtual void DidExportPdf(bool success) override;
-  virtual bool IsCancelled() override;
+  void DidExportPdf(bool success) override;
+  bool IsCancelled() override;
 
  private:
   void CreatePdfSettings(JNIEnv* env, jobject obj);
 
   JavaObjectWeakGlobalRef java_ref_;
   content::WebContents* web_contents_;
 
   scoped_ptr<printing::PrintSettings> print_settings_;
 
   DISALLOW_COPY_AND_ASSIGN(AwPdfExporter);
 };
 
 bool RegisterAwPdfExporter(JNIEnv* env);
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_NATIVE_AW_PDF_EXPORTER_H_