[Mojo] Move JS bindings out of public

mojo/public/bindings/js/test/hexdump.js

-// Copyright 2013 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.
-
-define(function() {
-  function hexify(value, length) {
-    var hex = value.toString(16);
-    while (hex.length < length)
-      hex = "0" + hex;
-    return hex;
-  }
-
-  function dumpArray(bytes) {
-    var dumped = "";
-    for (var i = 0; i < bytes.length; ++i) {
-      dumped += hexify(bytes[i], 2);
-
-      if (i % 16 == 15) {
-        dumped += "\n";
-        continue;
-      }
-
-      if (i % 2 == 1)
-        dumped += " ";
-      if (i % 8 == 7)
-        dumped += " ";
-    }
-    return dumped;
-  }
-
-  var exports = {};
-  exports.dumpArray = dumpArray;
-  return exports;
-});