Revert of Mojo JS bindings: change module loading solution.

mojo/public/js/new_bindings/base.js

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-if (mojoBindings) {
-  throw new Error('mojoBindings has been initialized.');
-}
-
-var mojoBindings = {};
-mojoBindings.internal = {};
-mojoBindings.internal.global = this;
-
-(function() {
-  var internal = mojoBindings.internal;
-
-  function exposeNamespace(namespace) {
-    var current = internal.global;
-    var parts = namespace.split('.');
-
-    for (var part; parts.length && (part = parts.shift());) {
-      if (!current[part]) {
-        current[part] = {};
-      }
-      current = current[part];
-    }
-
-    return current;
-  }
-
-  internal.exposeNamespace = exposeNamespace;
-})();