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

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 1083 matching lines @@
   if (!error.IsNull()) {
     return error.raw();
   }
   Library& lib = Library::Handle();
   INIT_LIBRARY(Crypto,
                Bootstrap::LoadCryptoScript(false),
                Library::CryptoLibrary());
   INIT_LIBRARY(Json,
                Bootstrap::LoadJsonScript(false),
                Library::JsonLibrary());
+  patch_script = Bootstrap::LoadJsonScript(true);
+  error = lib.Patch(patch_script);
+  if (!error.IsNull()) {
+    return error.raw();
+  }
   INIT_LIBRARY(Utf,
                Bootstrap::LoadUtfScript(false),
                Library::UtfLibrary());
   INIT_LIBRARY(Uri,
                Bootstrap::LoadUriScript(false),
                Library::UriLibrary());
   Bootstrap::SetupNativeResolver();
 
   // Remove the Object superclass cycle by setting the super type to null (not
   // to the type of null).
@@ skipping 11878 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart