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

chrome/browser/printing/printing_message_filter.h

Index: chrome/browser/printing/printing_message_filter.h
diff --git a/chrome/browser/printing/printing_message_filter.h b/chrome/browser/printing/printing_message_filter.h
index b160ccef1974142807cd0023b9081ea6d52b9901..80ed60b4bfa21821bdb2d4bdce849a53763f976a 100644
--- a/chrome/browser/printing/printing_message_filter.h
+++ b/chrome/browser/printing/printing_message_filter.h
@@ -40,13 +40,12 @@ class PrintingMessageFilter : public content::BrowserMessageFilter {
   PrintingMessageFilter(int render_process_id, Profile* profile);
 
   // content::BrowserMessageFilter methods.
-  virtual void OverrideThreadForMessage(
-      const IPC::Message& message,
-      content::BrowserThread::ID* thread) override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OverrideThreadForMessage(const IPC::Message& message,
+                                content::BrowserThread::ID* thread) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
-  virtual ~PrintingMessageFilter();
+  ~PrintingMessageFilter() override;
 
 #if defined(OS_WIN)
   // Used to pass resulting EMF from renderer to browser in printing.