Make ZoneObject::operator delete not public.

src/jsregexp.h

Index: src/jsregexp.h
diff --git a/src/jsregexp.h b/src/jsregexp.h
index dfd415d5af8ad041a6959016d046b3a9a6a87610..480429b5efbba5dc2f6cfd88cfd739bd7e93adf9 100644
--- a/src/jsregexp.h
+++ b/src/jsregexp.h
@@ -591,7 +591,6 @@ class RegExpNode: public ZoneObject {
   : replacement_(NULL), trace_count_(0), zone_(zone) {
     bm_info_[0] = bm_info_[1] = NULL;
   }
-  virtual ~RegExpNode();
   virtual void Accept(NodeVisitor* visitor) = 0;
   // Generates a goto to this node or actually generates the code at this point.
   virtual void Emit(RegExpCompiler* compiler, Trace* trace) = 0;
@@ -685,6 +684,7 @@ class RegExpNode: public ZoneObject {
   enum LimitResult { DONE, CONTINUE };
   RegExpNode* replacement_;
 
+  virtual ~RegExpNode();
   LimitResult LimitVersions(RegExpCompiler* compiler, Trace* trace);
 
   void set_bm_info(bool not_at_start, BoyerMooreLookahead* bm) {