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

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

Original CL: https://codereview.chromium.org//12114021

This version modified to take advantage of dart:json being moved to VM.

Committed: https://code.google.com/p/dart/source/detail?r=18908

[sra1, 2013-02-22 04:32:35]

Hi Siva,

I might submit and revert to test Dartium while I wait for your review.

[siva, 2013-02-22 18:25:39]

The VM parts lgtm with one comment about not refactoring some of the code into a
macro as we are doing some work in that area.

https://codereview.chromium.org/12314055/diff/2001/runtime/vm/object.cc
File runtime/vm/object.cc (right):

https://codereview.chromium.org/12314055/diff/2001/runtime/vm/object.cc#newco...
runtime/vm/object.cc:649: }                                                     
                      \
Could you leave this the way it was without a macro. Ivan and I  are making some
changes here to streamline this library initialization code and the code here is
going to change a bit. It would be helpful if you just preserved the pattern as
is.

https://codereview.chromium.org/12314055/diff/2001/runtime/vm/object.cc#newco...
runtime/vm/object.cc:1093: PATCH_LIBRARY(lib, Bootstrap::LoadJsonScript(true));
Just add the patch code inline here.

[sra1, 2013-02-22 19:21:30]

Committed patchset #4 manually as r18908 (presubmit successful).