[DevTools] Prepare inspector_protocol build to move.

third_party/WebKit/Source/platform/inspector_protocol/Collections_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)}}_Collections_h
-#define {{"_".join(config.protocol.namespace)}}_Collections_h
-
-#include "{{config.protocol.package}}/Forward.h"
-#include <cstddef>
-
-#if defined(__APPLE__) && !defined(_LIBCPP_VERSION)
-#include <map>
-#include <set>
-
-{% for namespace in config.protocol.namespace %}
-namespace {{namespace}} {
-{% endfor %}
-
-template <class Key, class T> using HashMap = std::map<Key, T>;
-template <class Key> using HashSet = std::set<Key>;
-
-{% for namespace in config.protocol.namespace %}
-} // namespace {{namespace}}
-{% endfor %}
-
-#else
-#include <unordered_map>
-#include <unordered_set>
-
-{% for namespace in config.protocol.namespace %}
-namespace {{namespace}} {
-{% endfor %}
-
-template <class Key, class T> using HashMap = std::unordered_map<Key, T>;
-template <class Key> using HashSet = std::unordered_set<Key>;
-
-{% for namespace in config.protocol.namespace %}
-} // namespace {{namespace}}
-{% endfor %}
-
-#endif // defined(__APPLE__) && !defined(_LIBCPP_VERSION)
-
-// Macro that returns a compile time constant with the length of an array, but gives an error if passed a non-array.
-template<typename T, std::size_t Size> char (&ArrayLengthHelperFunction(T (&)[Size]))[Size];
-// GCC needs some help to deduce a 0 length array.
-#if defined(__GNUC__)
-template<typename T> char (&ArrayLengthHelperFunction(T (&)[0]))[0];
-#endif
-#define PROTOCOL_ARRAY_LENGTH(array) sizeof(::ArrayLengthHelperFunction(array))
-
-#endif // !defined({{"_".join(config.protocol.namespace)}}_Collections_h)