Switch to standard integer types in tools/.

tools/gn/label_ptr.h

 // Copyright (c) 2013 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 TOOLS_GN_LABEL_PTR_H_
 #define TOOLS_GN_LABEL_PTR_H_
 
+#include <stddef.h>
+
 #include <functional>
 
 #include "tools/gn/label.h"
 
 class Config;
 class ParseNode;
 class Target;
 
 // Structure that holds a labeled "thing". This is used for various places
 // where we need to store lists of targets or configs. We sometimes populate
@@ skipping 90 matching lines @@
 template<typename T> struct hash< LabelPtrPair<T> > {
   std::size_t operator()(const LabelPtrPair<T>& v) const {
     BASE_HASH_NAMESPACE::hash<Label> h;
     return h(v.label);
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // TOOLS_GN_LABEL_PTR_H_