Remove some dead ZoneList typedefs.

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
@@ skipping 77 matching lines @@
 
 class Debug;
 class PromiseOnStack;
 class Redirection;
 class Simulator;
 
 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);                     \
     if (__isolate__->has_scheduled_exception()) {         \
       return __isolate__->PromoteScheduledException();    \
     }                                                     \
   } while (false)
 
 // Macros for MaybeHandle.
 
@@ skipping 1573 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_