Modify the Chrome Linux zygote to support a nacl_helper executable,

chrome/common/nacl_types.h

Index: chrome/common/nacl_types.h
diff --git a/chrome/common/nacl_types.h b/chrome/common/nacl_types.h
index b61d9eff925e2a72b8c5e8c00bee024fbb3d03e4..3d77e2f706f41e508e8c333039861cf85859bd8d 100644
--- a/chrome/common/nacl_types.h
+++ b/chrome/common/nacl_types.h
@@ -7,6 +7,7 @@
 #define CHROME_COMMON_NACL_TYPES_H_
 #pragma once
 
+#include "base/native_library.h"  // for HANDLE and OS_POSIX
 #if defined(OS_POSIX)
 #include "base/file_descriptor_posix.h"
 #endif
@@ -19,7 +20,8 @@ namespace nacl {
   inline HANDLE ToNativeHandle(const FileDescriptor& desc) {
     return reinterpret_cast<HANDLE>(desc);
   }
-#elif defined(OS_POSIX)
+#endif
+#if defined(OS_POSIX)
   typedef base::FileDescriptor FileDescriptor;
   inline int ToNativeHandle(const FileDescriptor& desc) {
     return desc.fd;