One Zone per CompilationInfo.

src/json-parser.h

 // Copyright 2011 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 308 matching lines @@
       return ReportUnexpectedCharacter();
     }
   }
   AdvanceSkipWhitespace();
   return json_object;
 }
 
 // Parse a JSON array. Position must be right at '['.
 template <bool seq_ascii>
 Handle<Object> JsonParser<seq_ascii>::ParseJsonArray() {
-  ZoneScope zone_scope(isolate(), DELETE_ON_EXIT);
+  ZoneScope zone_scope(zone(), DELETE_ON_EXIT);
   ZoneList<Handle<Object> > elements(4, zone());
   ASSERT_EQ(c0_, '[');
 
   AdvanceSkipWhitespace();
   if (c0_ != ']') {
     do {
       Handle<Object> element = ParseJsonValue();
       if (element.is_null()) return ReportUnexpectedCharacter();
       elements.Add(element, zone());
     } while (MatchSkipWhiteSpace(','));
@@ skipping 255 matching lines @@
   }
   ASSERT_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_