MAPG-180 standardize form submit with AJAX

public/static/js/login/google_signup.js

@@ -1,16 +1,4 @@
 (function () {
-    var form = document.getElementById('googleSignupForm');
-
-    form.onsubmit = function (e) {
-        document.getElementById('loading').style.visibility = 'visible';
-
-        e.preventDefault();
-
-        MapGuesser.httpRequest('POST', form.action, function () {
-            window.location.replace('/');
-        });
-    };
-
     document.getElementById('cancelGoogleSignupButton').onclick = function () {
         document.getElementById('loading').style.visibility = 'visible';