replace OVERRIDE and FINAL with override and final in athena/

athena/extensions/shell/athena_shell_app_window_client.h

Index: athena/extensions/shell/athena_shell_app_window_client.h
diff --git a/athena/extensions/shell/athena_shell_app_window_client.h b/athena/extensions/shell/athena_shell_app_window_client.h
index 27b2eef612d255cdcfe3348033f0150aa52b111f..9aac189b6483da8aae3d498db3a442417020cd38 100644
--- a/athena/extensions/shell/athena_shell_app_window_client.h
+++ b/athena/extensions/shell/athena_shell_app_window_client.h
@@ -19,10 +19,10 @@ class AthenaShellAppWindowClient : public AthenaAppWindowClientBase {
   // extensions::AppWindowClient
   virtual extensions::AppWindow* CreateAppWindow(
       content::BrowserContext* context,
-      const extensions::Extension* extension) OVERRIDE;
+      const extensions::Extension* extension) override;
   virtual void OpenDevToolsWindow(content::WebContents* web_contents,
-                                  const base::Closure& callback) OVERRIDE;
-  virtual bool IsCurrentChannelOlderThanDev() OVERRIDE;
+                                  const base::Closure& callback) override;
+  virtual bool IsCurrentChannelOlderThanDev() override;
 
   DISALLOW_COPY_AND_ASSIGN(AthenaShellAppWindowClient);
 };