Remove use of goog.bind and use ES5 .bind

examples/mobile-full-screen.html

@@ -13,6 +13,7 @@ cloak:
     <meta http-equiv="X-UA-Compatible" content="chrome=1">
     <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
     <title>Mobile full screen example</title>
+    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Function.prototype.bind|gated"></script>
     <style type="text/css">
       html, body, .map {
         margin: 0;