Fix escaped index JSON parsing

BUG=416449
LOG=y
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/592813002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24125 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/json-parser.h

@@ -426,8 +426,7 @@ Handle<Object> JsonParser<seq_one_byte>::ParseJsonObject() {
         if (value.is_null()) return ReportUnexpectedCharacter();
       }
 
-      JSObject::SetOwnPropertyIgnoreAttributes(
-          json_object, key, value, NONE).Assert();
+      Runtime::DefineObjectProperty(json_object, key, value, NONE).Check();
     } while (MatchSkipWhiteSpace(','));
     if (c0_ != '}') {
       return ReportUnexpectedCharacter();

test/mjsunit/regress/regress-json-parse-index.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var o = JSON.parse('{"\\u0030":100}');
+assertEquals(100, o[0]);