Standardize usage of virtual/override/final in content/

content/public/browser/browser_message_filter.h

Index: content/public/browser/browser_message_filter.h
diff --git a/content/public/browser/browser_message_filter.h b/content/public/browser/browser_message_filter.h
index 491908dc3c09917f443cf590bdafff78babb267e..5ff787de788a4f923e1d51edcec19b3def0c2217 100644
--- a/content/public/browser/browser_message_filter.h
+++ b/content/public/browser/browser_message_filter.h
@@ -51,7 +51,7 @@ class CONTENT_EXPORT BrowserMessageFilter
 
   // IPC::Sender implementation.  Can be called on any thread.  Can't send sync
   // messages (since we don't want to block the browser on any other process).
-  virtual bool Send(IPC::Message* message) override;
+  bool Send(IPC::Message* message) override;
 
   // If you want the given message to be dispatched to your OnMessageReceived on
   // a different thread, there are two options, either
@@ -101,7 +101,7 @@ class CONTENT_EXPORT BrowserMessageFilter
   }
 
  protected:
-  virtual ~BrowserMessageFilter();
+  ~BrowserMessageFilter() override;
 
  private:
   friend class base::RefCountedThreadSafe<BrowserMessageFilter,