Get rid of the ZoneScopeMode.

src/gdb-jit.cc

 // Copyright 2010 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1899 matching lines @@
     entry->next_->prev_ = entry->prev_;
   }
 
   __jit_debug_descriptor.relevant_entry_ = entry;
   __jit_debug_descriptor.action_flag_ = JIT_UNREGISTER_FN;
   __jit_debug_register_code();
 }
 
 
 static JITCodeEntry* CreateELFObject(CodeDescription* desc, Zone* zone) {
-  ZoneScope zone_scope(zone, DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone);
 #ifdef __MACH_O
   MachO mach_o;
   Writer w(&mach_o);
 
   mach_o.AddSection(new MachOTextSection(kCodeAlignment,
                                          desc->CodeStart(),
                                          desc->CodeSize()));
 
   CreateDWARFSections(desc, &mach_o);
 
@@ skipping 239 matching lines @@
   ScopedLock lock(mutex.Pointer());
   ASSERT(!IsLineInfoTagged(line_info));
   HashMap::Entry* e = GetEntries()->Lookup(code, HashForCodeObject(code), true);
   ASSERT(e->value == NULL);
   e->value = TagLineInfo(line_info);
 }
 
 
 } }  // namespace v8::internal
 #endif