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

content/browser/browser_plugin/browser_plugin_embedder.h

Index: content/browser/browser_plugin/browser_plugin_embedder.h
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.h b/content/browser/browser_plugin/browser_plugin_embedder.h
index e8b249cc6e1dcf0429f3b02efa84583422b79137..7ea98f7773a5ea22bd168c15921fdd00b8ba8cf6 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.h
+++ b/content/browser/browser_plugin/browser_plugin_embedder.h
@@ -39,7 +39,7 @@ struct NativeWebKeyboardEvent;
 
 class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
  public:
-  virtual ~BrowserPluginEmbedder();
+  ~BrowserPluginEmbedder() override;
 
   static BrowserPluginEmbedder* Create(WebContentsImpl* web_contents);
 
@@ -50,7 +50,7 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
   void DidSendScreenRects();
 
   // WebContentsObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   void DragSourceEndedAt(int client_x, int client_y, int screen_x,
       int screen_y, blink::WebDragOperation operation);