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

content/browser/shared_worker/shared_worker_message_filter.h

Index: content/browser/shared_worker/shared_worker_message_filter.h
diff --git a/content/browser/shared_worker/shared_worker_message_filter.h b/content/browser/shared_worker/shared_worker_message_filter.h
index 4c8d28c95adbace2f52686defc4b7e3abe597a59..e283a22f2d95d30cde2450c0011aeb8727e73a94 100644
--- a/content/browser/shared_worker/shared_worker_message_filter.h
+++ b/content/browser/shared_worker/shared_worker_message_filter.h
@@ -26,8 +26,8 @@ class CONTENT_EXPORT SharedWorkerMessageFilter : public BrowserMessageFilter {
                             MessagePortMessageFilter* message_port_filter);
 
   // BrowserMessageFilter implementation.
-  virtual void OnChannelClosing() override;
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  void OnChannelClosing() override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   int GetNextRoutingID();
   int render_process_id() const { return render_process_id_; }
@@ -38,7 +38,7 @@ class CONTENT_EXPORT SharedWorkerMessageFilter : public BrowserMessageFilter {
 
  protected:
   // This is protected, so we can define sub classes for testing.
-  virtual ~SharedWorkerMessageFilter();
+  ~SharedWorkerMessageFilter() override;
 
  private:
   // Message handlers.