Include what you use for the files zone*

src/zone.h

Index: src/zone.h
diff --git a/src/zone.h b/src/zone.h
index 2ca3c4d369e3977be5ecbf002c9b528985636547..d0db912c0cb3a5c88093e3d01d72d04afe222a75 100644
--- a/src/zone.h
+++ b/src/zone.h
@@ -28,7 +28,13 @@
 #ifndef V8_ZONE_H_
 #define V8_ZONE_H_
 
+#include <stddef.h>

[Kevin Millikin (Chromium), 2012/01/30 09:25:45]

globals.h includes ../include/v8stdint.h, which includes <stddef.h>.  I think
it's safe to rely on that, otherwise we would be including <stddef.h> (for NULL)
in almost every single file.

Suggestion: remove this line, "globals.h" is enough.

+
 #include "allocation.h"
+#include "checks.h"
+#include "globals.h"
+#include "list.h"
+#include "splay-tree.h"
 
 namespace v8 {
 namespace internal {
@@ -42,6 +48,7 @@ enum ZoneScopeMode {
 };
 
 class Segment;
+class Isolate;
 
 // The Zone supports very fast allocation of small chunks of
 // memory. The chunks cannot be deallocated individually, but instead