Update to using //mojo/public/js

mojo/public/mojo_public.gyp

 # Copyright 2014 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.
 
 {
   'includes': [
     '../mojo_variables.gypi',
   ],
   'targets': [
     {
@@ skipping 112 matching lines @@
       ],
     },
     {
       # GN version: //mojo/public/js/bindings
       'target_name': 'mojo_js_bindings',
       'type': 'static_library',
       'include_dirs': [
         '../..'
       ],
       'sources': [
-        'js/bindings/constants.cc',
-        'js/bindings/constants.h',
+        'js/constants.cc',
+        'js/constants.h',
       ],
     },
     {
       # GN version: //mojo/public/cpp/environment:standalone
       'target_name': 'mojo_environment_standalone',
       'type': 'static_library',
       'sources': [
         'c/environment/async_waiter.h',
         'c/environment/logger.h',
         'cpp/environment/environment.h',
@@ skipping 213 matching lines @@
            },
            'dependencies': [
              'mojo_public_java',
            ],
            'includes': [ '../../build/java.gypi' ],
         },
       ],
     }],
   ],
 }