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

content/browser/browser_url_handler_impl.h

Index: content/browser/browser_url_handler_impl.h
diff --git a/content/browser/browser_url_handler_impl.h b/content/browser/browser_url_handler_impl.h
index 749b3a17018645dcc1322ff76b933ee8292f806a..240554b76813a2ef7c8aa31eb045f46c2ed0ea0b 100644
--- a/content/browser/browser_url_handler_impl.h
+++ b/content/browser/browser_url_handler_impl.h
@@ -23,12 +23,11 @@ class CONTENT_EXPORT BrowserURLHandlerImpl : public BrowserURLHandler {
   static BrowserURLHandlerImpl* GetInstance();
 
   // BrowserURLHandler implementation:
-  virtual void RewriteURLIfNecessary(GURL* url,
-                                     BrowserContext* browser_context,
-                                     bool* reverse_on_redirect) override;
+  void RewriteURLIfNecessary(GURL* url,
+                             BrowserContext* browser_context,
+                             bool* reverse_on_redirect) override;
   // Add the specified handler pair to the list of URL handlers.
-  virtual void AddHandlerPair(URLHandler handler,
-                              URLHandler reverse_handler) override;
+  void AddHandlerPair(URLHandler handler, URLHandler reverse_handler) override;
 
   // Reverses the rewriting that was done for |original| using the new |url|.
   bool ReverseURLRewrite(GURL* url, const GURL& original,
@@ -37,7 +36,7 @@ class CONTENT_EXPORT BrowserURLHandlerImpl : public BrowserURLHandler {
  private:
   // This object is a singleton:
   BrowserURLHandlerImpl();
-  virtual ~BrowserURLHandlerImpl();
+  ~BrowserURLHandlerImpl() override;
   friend struct DefaultSingletonTraits<BrowserURLHandlerImpl>;
 
   // The list of known URLHandlers, optionally with reverse-rewriters.