Switch to standard integer types in tools/.

tools/gn/toolchain.cc

 // 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.
 
 #include "tools/gn/toolchain.h"
 
+#include <stddef.h>
 #include <string.h>
 
 #include "base/logging.h"
 #include "tools/gn/target.h"
 #include "tools/gn/value.h"
 
 const char* Toolchain::kToolCc = "cc";
 const char* Toolchain::kToolCxx = "cxx";
 const char* Toolchain::kToolObjC = "objc";
 const char* Toolchain::kToolObjCxx = "objcxx";
@@ skipping 138 matching lines @@
       return TYPE_STAMP;
     default:
       NOTREACHED();
       return Toolchain::TYPE_NONE;
   }
 }
 
 const Tool* Toolchain::GetToolForTargetFinalOutput(const Target* target) const {
   return tools_[GetToolTypeForTargetFinalOutput(target)].get();
 }