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

chrome/browser/safe_json_parser.h

Index: chrome/browser/safe_json_parser.h
diff --git a/chrome/browser/safe_json_parser.h b/chrome/browser/safe_json_parser.h
index ebdae86bb08a1af99e79fc15e4fb97657bbb9002..67ca5479adc5f5f71bd2551d7c804685ef624520 100644
--- a/chrome/browser/safe_json_parser.h
+++ b/chrome/browser/safe_json_parser.h
@@ -36,7 +36,7 @@ class SafeJsonParser : public content::UtilityProcessHostClient {
   void Start();
 
  private:
-  virtual ~SafeJsonParser();
+  ~SafeJsonParser() override;
 
   void StartWorkOnIOThread();
 
@@ -47,7 +47,7 @@ class SafeJsonParser : public content::UtilityProcessHostClient {
   void ReportResultOnUIThread();
 
   // Implementing pieces of the UtilityProcessHostClient interface.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   const std::string unsafe_json_;
   SuccessCallback success_callback_;