Standardize usage of virtual/override/final in content/browser/

content/browser/renderer_host/pepper/pepper_message_filter.h

Index: content/browser/renderer_host/pepper/pepper_message_filter.h
diff --git a/content/browser/renderer_host/pepper/pepper_message_filter.h b/content/browser/renderer_host/pepper/pepper_message_filter.h
index 1767cf8152ebe6eb086011dae2ad469ff5ef2260..02a89adf016f1589fb857cb0d5594b6e083a357c 100644
--- a/content/browser/renderer_host/pepper/pepper_message_filter.h
+++ b/content/browser/renderer_host/pepper/pepper_message_filter.h
@@ -24,10 +24,10 @@ class PepperMessageFilter : public BrowserMessageFilter {
   PepperMessageFilter();
 
   // BrowserMessageFilter methods.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  protected:
-  virtual ~PepperMessageFilter();
+  ~PepperMessageFilter() override;
 
  private:
   void OnX509CertificateParseDER(const std::vector<char>& der,