Cleanup headless templates and message_dispatcher.h.

headless/lib/browser/devtools_api/domain_types_forward_declarations_h.template

 // This file is generated
 
-// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Copyright 2016 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.
 
 #ifndef HEADLESS_PUBLIC_DEVTOOLS_INTERNAL_TYPES_FORWARD_DECLARATIONS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
 #define HEADLESS_PUBLIC_DEVTOOLS_INTERNAL_TYPES_FORWARD_DECLARATIONS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
 
-#include "base/optional.h"
 #include "base/values.h"
-#include "headless/public/headless_export.h"
-#include "headless/public/util/error_reporter.h"
-
-#include "base/memory/ptr_util.h"
 
 namespace headless {
 
 namespace {{domain.domain | camelcase_to_hacker_style}} {
 {% for type in domain.types %}
   {% if type.type == "object" %}
     {% if "properties" in type %}
 class {{type.id}};
     {% else %}
 using {{type.id}} = base::Value;
     {% endif %}
   {% endif %}
 {% endfor %}
 
 {% for type in domain.types %}
   {% if "enum" in type %}
 enum class {{type.id}} {
     {% for literal in type.enum %}
   {{ literal | sanitize_literal | dash_to_camelcase | camelcase_to_hacker_style | upper }}{{',' if not loop.last}}
     {% endfor %}
 };
 
   {% endif %}
 {% endfor %}
 }  // namespace {{domain.domain | camelcase_to_hacker_style}}
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_DEVTOOLS_INTERNAL_TYPES_FORWARD_DECLARATIONS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_