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

content/renderer/android/phone_number_detector.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_RENDERER_ANDROID_PHONE_NUMBER_DETECTOR_H_
 #define CONTENT_RENDERER_ANDROID_PHONE_NUMBER_DETECTOR_H_
 
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "content/renderer/android/content_detector.h"
 
 namespace content {
 
 class PhoneNumberDetectorTest;
 
 // Finds a telephone number in the given content text string.
 class CONTENT_EXPORT PhoneNumberDetector : public ContentDetector {
  public:
   PhoneNumberDetector();
   explicit PhoneNumberDetector(const std::string& region);
-  virtual ~PhoneNumberDetector();
+  ~PhoneNumberDetector() override;
 
  private:
   friend class PhoneNumberDetectorTest;
 
   // Implementation of ContentDetector.
-  virtual bool FindContent(const base::string16::const_iterator& begin,
-                           const base::string16::const_iterator& end,
-                           size_t* start_pos,
-                           size_t* end_pos,
-                           std::string* content_text) override;
-  virtual GURL GetIntentURL(const std::string& content_text) override;
-  virtual size_t GetMaximumContentLength() override;
+  bool FindContent(const base::string16::const_iterator& begin,
+                   const base::string16::const_iterator& end,
+                   size_t* start_pos,
+                   size_t* end_pos,
+                   std::string* content_text) override;
+  GURL GetIntentURL(const std::string& content_text) override;
+  size_t GetMaximumContentLength() override;
 
   const std::string region_code_;
 
   DISALLOW_COPY_AND_ASSIGN(PhoneNumberDetector);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_PHONE_NUMBER_DETECTOR_H_