Standardize usage of virtual/override/final in content/

content/child/resource_dispatcher.h

Index: content/child/resource_dispatcher.h
diff --git a/content/child/resource_dispatcher.h b/content/child/resource_dispatcher.h
index 17e19f9be8d920c5d4d126de785a70898e25c159..ac6fbda9cc180be212e4deb58aa45144639acc6b 100644
--- a/content/child/resource_dispatcher.h
+++ b/content/child/resource_dispatcher.h
@@ -48,10 +48,10 @@ struct SiteIsolationResponseMetaData;
 class CONTENT_EXPORT ResourceDispatcher : public IPC::Listener {
  public:
   explicit ResourceDispatcher(IPC::Sender* sender);
-  virtual ~ResourceDispatcher();
+  ~ResourceDispatcher() override;
 
   // IPC::Listener implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   // Creates a ResourceLoaderBridge for this type of dispatcher, this is so
   // this can be tested regardless of the ResourceLoaderBridge::Create