Switch to standard integer types in tools/.

tools/gn/label_pattern.cc

 // 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.
 
 #include "tools/gn/label_pattern.h"
 
+#include <stddef.h>
+
 #include "base/strings/string_util.h"
+#include "build/build_config.h"
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/value.h"
 
 const char kLabelPattern_Help[] =
     "Label patterns\n"
     "\n"
     "  A label pattern is a way of expressing one or more labels in a portion\n"
     "  of the source tree. They are not general regular expressions.\n"
     "\n"
@@ skipping 239 matching lines @@
       break;
   }
 
   if (!toolchain_.is_null()) {
     result.push_back('(');
     result.append(toolchain_.GetUserVisibleName(false));
     result.push_back(')');
   }
   return result;
 }