Use browsers JSON.parse for parsing JSON (#3)

runtime/vm/bootstrap.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/bootstrap.h"
 
 #include "include/dart_api.h"
 
 #include "vm/bootstrap_natives.h"
 #include "vm/compiler.h"
@@ skipping 54 matching lines @@
 
 RawScript* Bootstrap::LoadIsolateScript(bool patch)  {
   const char* url = patch ? "dart:isolate-patch" : "dart:isolate";
   const char* source = patch ? isolate_patch_ : isolate_source_;
   return LoadScript(url, source, patch);
 }
 
 
 RawScript* Bootstrap::LoadJsonScript(bool patch) {
   const char* url = patch ? "dart:json-patch" : "dart:json";
-  const char* source = patch ? json_source_ : json_source_;
+  const char* source = patch ? json_patch_ : json_source_;
   return LoadScript(url, source, patch);
 }
 
 
 RawScript* Bootstrap::LoadMathScript(bool patch) {
   const char* url = patch ? "dart:math-patch" : "dart:math";
   const char* source = patch ? math_patch_ : math_source_;
   return LoadScript(url, source, patch);
 }
 
@@ skipping 36 matching lines @@
   const Error& error = Error::Handle(Compiler::Compile(library, script));
   if (error.IsNull()) {
     library.SetLoaded();
   } else {
     library.SetLoadError();
   }
   return error.raw();
 }
 
 }  // namespace dart