[DevTools] Prepare inspector_protocol build to move.

third_party/WebKit/Source/platform/inspector_protocol/Forward_h.template

-// 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 {{"_".join(config.protocol.namespace)}}_Forward_h
-#define {{"_".join(config.protocol.namespace)}}_Forward_h
-
-#include "{{config.class_export.header}}"
-#include "{{config.lib.platform_header}}"
-#include "{{config.lib.string_header}}"
-
-#include <vector>
-
-{% for namespace in config.protocol.namespace %}
-namespace {{namespace}} {
-{% endfor %}
-
-template<typename T> class Array;
-class DictionaryValue;
-using ErrorString = String;
-class ErrorSupport;
-class FundamentalValue;
-class ListValue;
-template<typename T> class Maybe;
-class Object;
-class SerializedValue;
-class StringValue;
-class UberDispatcher;
-class Value;
-
-{% for namespace in config.protocol.namespace %}
-} // namespace {{namespace}}
-{% endfor %}
-
-#endif // !defined({{"_".join(config.protocol.namespace)}}_Forward_h)