[bindings] Include copyright block in generated code for consistency.

Source/bindings/templates/callback_interface.cpp

-// 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.
-
-// This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
-
+{% include 'copyright_block.txt' %}
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "{{v8_class}}.h"
 
 {% for filename in cpp_includes %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
@@ skipping 56 matching lines @@
     ScriptController::callFunction(m_scriptState->executionContext(), m_callback.newLocal(m_scriptState->isolate()), {{this_handle_parameter}}{{method.arguments | length}}, argv, m_scriptState->isolate());
     return !exceptionCatcher.HasCaught();
     {% else %}{# void #}
     ScriptController::callFunction(m_scriptState->executionContext(), m_callback.newLocal(m_scriptState->isolate()), {{this_handle_parameter}}{{method.arguments | length}}, argv, m_scriptState->isolate());
     {% endif %}
 }
 
 {% endfor %}
 } // namespace blink
 {% endfilter %}