Refactor allocation policies.

src/json-parser.h

Index: src/json-parser.h
diff --git a/src/json-parser.h b/src/json-parser.h
index 3ef5afbb895f403bad7e007342fdaaf6a78ea8b4..22bf353b92a87e4e0390b7c1742b0dbca36dda76 100644
--- a/src/json-parser.h
+++ b/src/json-parser.h
@@ -149,6 +149,7 @@ class JsonParser BASE_EMBEDDED {
   }
 
   inline Isolate* isolate() { return isolate_; }
+  inline Zone* zone() { return isolate_->zone(); }
 
   static const int kInitialSpecialStringLength = 1024;
 
@@ -321,7 +322,7 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
 template <bool seq_ascii>
 Handle<Object> JsonParser<seq_ascii>::ParseJsonArray() {
   ZoneScope zone_scope(isolate(), DELETE_ON_EXIT);
-  ZoneList<Handle<Object> > elements(4);
+  ZoneList<Handle<Object> > elements(zone(), 4);
   ASSERT_EQ(c0_, '[');
 
   AdvanceSkipWhitespace();