Include what you use for the preparser.

src/conversions.cc

Index: src/conversions.cc
diff --git a/src/conversions.cc b/src/conversions.cc
index 5bfddd04c01c025b3de2caf9cafbcbb0c6f8b549..1279ea4d7f5559d567b7e33b5ace9deb2a6973be 100644
--- a/src/conversions.cc
+++ b/src/conversions.cc
@@ -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:
@@ -25,14 +25,10 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <stdarg.h>
-#include <math.h>
-#include <limits.h>
-
 #include "conversions-inl.h"
+
+#include "allocation.h"
 #include "dtoa.h"
-#include "strtod.h"
-#include "utils.h"
 
 namespace v8 {
 namespace internal {