Remove some dead ZoneList typedefs.

R=marja@chromium.org

Review-Url: https://codereview.chromium.org/2359443002
Cr-Commit-Position: refs/heads/master@{#39577}

src/ast/ast.h

@@ -126,11 +126,6 @@ AST_NODE_LIST(DEF_FORWARD_DECLARATION)
 #undef DEF_FORWARD_DECLARATION
 
 
-// Typedef only introduced to avoid unreadable code.
-typedef ZoneList<Handle<String>> ZoneStringList;
-typedef ZoneList<Handle<Object>> ZoneObjectList;
-
-
 class FeedbackVectorSlotCache {
  public:
   explicit FeedbackVectorSlotCache(Zone* zone)

src/isolate.h

@@ -94,14 +94,6 @@ 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);                     \