Remove some dead ZoneList typedefs.

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index d8a50c15679658644eb267fbf4d19ce9def9d037..05b4222865e647240d3ffd12f490212a16ee47ce 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -95,14 +95,6 @@ namespace interpreter {
 class Interpreter;
 }
 
-// Static indirection table for handles to constants.  If a frame
-// element represents a constant, the data contains an index into
-// this table of handles to the actual constants.
-// Static indirection table for handles to constants.  If a Result
-// represents a constant, the data contains an index into this table
-// of handles to the actual constants.
-typedef ZoneList<Handle<Object> > ZoneObjectList;
-
 #define RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate)    \
   do {                                                    \
     Isolate* __isolate__ = (isolate);                     \