Mojo: Reimplement unicode.js in JavaScript, remove native implementation.

mojo/mojo.gyp

 # 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.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 625 matching lines @@
         '../gin/gin.gyp:gin',
         'mojo_common_lib',
       ],
       'sources': [
         'bindings/js/core.cc',
         'bindings/js/core.h',
         'bindings/js/handle.cc',
         'bindings/js/handle.h',
         'bindings/js/support.cc',
         'bindings/js/support.h',
-        'bindings/js/unicode.cc',
-        'bindings/js/unicode.h',
         'bindings/js/waiting_callback.cc',
         'bindings/js/waiting_callback.h',
       ],
     },
     {
       'target_name': 'mojo_js_unittests',
       'type': 'executable',
       'dependencies': [
         '../gin/gin.gyp:gin_test',
         'mojo_common_test_support',
@@ skipping 247 matching lines @@
             'aura/screen_mojo.cc',
             'aura/screen_mojo.h',
             'aura/window_tree_host_mojo.cc',
             'aura/window_tree_host_mojo.h',
           ],
         },
       ],
     }],
   ],
 }