Standardize usage of virtual/override/final in components/

components/nacl/loader/nacl_listener.h

Index: components/nacl/loader/nacl_listener.h
diff --git a/components/nacl/loader/nacl_listener.h b/components/nacl/loader/nacl_listener.h
index 6a6e8c2cd2e9a86f76b7bf1f9dec74c275bd40ae..9e8d67b65747d96b35f3391e7bb95a22faf55f0a 100644
--- a/components/nacl/loader/nacl_listener.h
+++ b/components/nacl/loader/nacl_listener.h
@@ -29,7 +29,7 @@ class SyncMessageFilter;
 class NaClListener : public IPC::Listener {
  public:
   NaClListener();
-  virtual ~NaClListener();
+  ~NaClListener() override;
   // Listen for a request to launch a NaCl module.
   void Listen();
 
@@ -59,7 +59,7 @@ class NaClListener : public IPC::Listener {
                            base::FilePath file_path);
 
  private:
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   void OnStart(const nacl::NaClStartParams& params);