Use |isolate| local variable in bindings, clean up comments

Source/bindings/templates/callback_interface.cpp

-{# http://www.chromium.org/blink/coding-style#TOC-License #}
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- * in the documentation and/or other materials provided with the
- * distribution.
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+// 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.
 
-{# FIXME: Rename to Python when switch #}
-// This file has been auto-generated by code_generator_v8.pm. DO NOT MODIFY!
+// This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "{{v8_class}}.h"
 
 {% for filename in cpp_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace WebCore {
@@ skipping 52 matching lines @@
     {% if method.idl_type == 'boolean' %}
     return invokeCallback(m_callback.newLocal(m_isolate), {{this_handle_parameter}}{{method.arguments | length}}, argv, executionContext(), m_isolate);
     {% else %}{# void #}
     invokeCallback(m_callback.newLocal(m_isolate), {{this_handle_parameter}}{{method.arguments | length}}, argv, executionContext(), m_isolate);
     {% endif %}
 }
 
 {% endfor %}
 } // namespace WebCore
 {% endfilter %}