Switch to standard integer types in tools/.

tools/gn/command_path.cc

 // Copyright 2015 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 <stddef.h>
+
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/strings/stringprintf.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
 
 namespace commands {
@@ skipping 294 matching lines @@
         OutputString(base::StringPrintf(" %d of them are public.\n",
             static_cast<int>(state.found_public.size())));
       }
       OutputString("Use --all to print all paths.\n");
     }
   }
   return 0;
 }
 
 }  // namespace commands