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 (mojo && mojo.internal) {
+  throw new Error('The Mojo bindings library has been initialized.');
+}
+
+var mojo = mojo || {};
+mojo.internal = {};
+mojo.internal.global = this;
+
+(function() {
+  var internal = mojo.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;
+})();