Get rid of the ZoneScopeMode.

src/zone.h

 // Copyright 2012 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 21 matching lines @@
 #include "checks.h"
 #include "hashmap.h"
 #include "globals.h"
 #include "list.h"
 #include "splay-tree.h"
 
 namespace v8 {
 namespace internal {
 
 
-// Zone scopes are in one of two modes.  Either they delete the zone
-// on exit or they do not.
-enum ZoneScopeMode {
-  DELETE_ON_EXIT,
-  DONT_DELETE_ON_EXIT
-};
-
 class Segment;
 class Isolate;
 
 // The Zone supports very fast allocation of small chunks of
 // memory. The chunks cannot be deallocated individually, but instead
 // the Zone supports deallocating all chunks in one fast
 // operation. The Zone is used to hold temporary data structures like
 // the abstract syntax tree, which is deallocated after compilation.
 
 // Note: There is no need to initialize the Zone; the first time an
@@ skipping 171 matching lines @@
   void operator delete(void* pointer) { UNREACHABLE(); }
   void operator delete(void* pointer, Zone* zone) { UNREACHABLE(); }
 };
 
 
 // ZoneScopes keep track of the current parsing and compilation
 // nesting and cleans up generated ASTs in the Zone when exiting the
 // outer-most scope.
 class ZoneScope BASE_EMBEDDED {
  public:
-  INLINE(ZoneScope(Zone* zone, ZoneScopeMode mode));
+  INLINE(ZoneScope(Zone* zone));
 
   virtual ~ZoneScope();
 
   Zone* zone() const { return zone_; }
 
   inline bool ShouldDeleteOnExit();
 
-  // For ZoneScopes that do not delete on exit by default, call this
-  // method to request deletion on exit.
-  void DeleteOnExit() {
-    mode_ = DELETE_ON_EXIT;
-  }
-
   inline static int nesting();
 
  private:
   Zone* zone_;
-  ZoneScopeMode mode_;
 };
 
 
 // A zone splay tree.  The config type parameter encapsulates the
 // different configurations of a concrete splay tree (see splay-tree.h).
 // The tree itself and all its elements are allocated in the Zone.
 template <typename Config>
 class ZoneSplayTree: public SplayTree<Config, ZoneAllocationPolicy> {
  public:
   explicit ZoneSplayTree(Zone* zone)
       : SplayTree<Config, ZoneAllocationPolicy>(ZoneAllocationPolicy(zone)) {}
   ~ZoneSplayTree();
 };
 
 
 typedef TemplateHashMapImpl<ZoneAllocationPolicy> ZoneHashMap;
 
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_H_