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

chrome/browser/android/intercept_download_resource_throttle.h

Index: chrome/browser/android/intercept_download_resource_throttle.h
diff --git a/chrome/browser/android/intercept_download_resource_throttle.h b/chrome/browser/android/intercept_download_resource_throttle.h
index f476a87428f7c710e090b9581b91ba80bb1b407b..6ecfb439739dcee5e9d0c7915c56290ddf8e7998 100644
--- a/chrome/browser/android/intercept_download_resource_throttle.h
+++ b/chrome/browser/android/intercept_download_resource_throttle.h
@@ -25,11 +25,11 @@ class InterceptDownloadResourceThrottle : public content::ResourceThrottle {
                                     int request_id);
 
   // content::ResourceThrottle implementation:
-  virtual void WillProcessResponse(bool* defer) override;
-  virtual const char* GetNameForLogging() const override;
+  void WillProcessResponse(bool* defer) override;
+  const char* GetNameForLogging() const override;
 
  private:
-  virtual ~InterceptDownloadResourceThrottle();
+  ~InterceptDownloadResourceThrottle() override;
 
   void ProcessDownloadRequest();
   // Set to true when if we want chrome to handle the download.