WebUI: Fix violations of no-extra-semi lint rule.

ui/webui/resources/js/cr/ui/alert_overlay.js

Index: ui/webui/resources/js/cr/ui/alert_overlay.js
diff --git a/ui/webui/resources/js/cr/ui/alert_overlay.js b/ui/webui/resources/js/cr/ui/alert_overlay.js
index f3962d1867a9c6f22d98aa0c129e3f9e4948807a..4d2ff814ff7f6f1c6980e31a714732ba02235fdf 100644
--- a/ui/webui/resources/js/cr/ui/alert_overlay.js
+++ b/ui/webui/resources/js/cr/ui/alert_overlay.js
@@ -35,7 +35,7 @@ cr.define('alertOverlay', function() {
       okButton.clickCallback = null;
       cancelButton.clickCallback = null;
     });
-  };
+  }
 
   /**
    * Updates the alert overlay with the given message, button titles, and
@@ -72,7 +72,7 @@ cr.define('alertOverlay', function() {
       cancelButton.textContent = opt_cancelTitle;
     cancelButton.hidden = !opt_cancelTitle;
     cancelButton.clickCallback = opt_cancelCallback;
-  };
+  }
 
   // Export
   return {initialize: initialize, setValues: setValues};