Reference js files via plugin_file

GoogleOauth.php

@@ -49,7 +49,7 @@ function resources() {
 		return '
 			<meta name="redirectUri" content="' . plugin_config_get( 'redirect_uri' ) . '" />
 			<meta name="clientId" content="' . plugin_config_get( 'clientId' ) . '" />
-			<script type="text/javascript" src="plugins/GoogleOauth/pages/assets/js/plugin.js"></script>
+			<script type="text/javascript" src="' . plugin_file( 'js/plugin.js' ) . '"></script>
 		';
 	}
 }