Include what you use for the preparser.

src/conversions.h

Index: src/conversions.h
diff --git a/src/conversions.h b/src/conversions.h
index 70559c9e9d7979f449110793bbdde122cd1d99a5..ac8b175ddc2bdb89253288c3e9af6ea4cb17cc70 100644
--- a/src/conversions.h
+++ b/src/conversions.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -28,12 +28,13 @@
 #ifndef V8_CONVERSIONS_H_
 #define V8_CONVERSIONS_H_
 
-#include "utils.h"
+#include "globals.h"
 
 namespace v8 {
 namespace internal {
 
 class UnicodeCache;
+template <typename T> class Vector;
 
 // Maximum number of significant digits in decimal representation.
 // The longest possible double in decimal representation is
@@ -95,9 +96,7 @@ inline int32_t DoubleToInt32(double x);
 
 
 // This function should match the exact semantics of ECMA-262 9.6.
-inline uint32_t DoubleToUint32(double x) {
-  return static_cast<uint32_t>(DoubleToInt32(x));
-}
+inline uint32_t DoubleToUint32(double x);
 
 
 // Enumeration for allowing octals and ignoring junk when converting