Mojo JS bindings: remove usage of the connection module.

mojo/public/tools/bindings/generators/js_templates/module.amd.tmpl

 // 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.
 
 define("{{module.path}}", [
     "mojo/public/js/bindings",
     "mojo/public/js/codec",
-    "mojo/public/js/connection",
     "mojo/public/js/core",
     "mojo/public/js/validator",
 {%- for import in imports %}
     "{{import.module.path}}",
 {%- endfor %}
-], function(bindings, codec, connection, core, validator
+], function(bindings, codec, core, validator
 {%- for import in imports -%}
     , {{import.unique_name}}
 {%- endfor -%}
 ) {
 
 {%- include "module_definition.tmpl" %}
 
   return exports;
 });