Don't double-allocate mutable heap numbers in the json parser. This removes some stupidity when com…

Don't double-allocate mutable heap numbers in the json parser. This removes some stupidity when committing state.

BUG=

Committed: https://crrev.com/67d531c33c7bec956810189273ab51beae8a0727
Cr-Commit-Position: refs/heads/master@{#27034}

[Toon Verwaest, 2015-03-05 14:33:52]

verwaest@chromium.org changed reviewers:
+ yangguo@chromium.org

[Toon Verwaest, 2015-03-05 14:33:52]

PTAL

[Igor Sheludko, 2015-03-06 07:53:21]

ishell@chromium.org changed reviewers:
+ ishell@chromium.org

[Igor Sheludko, 2015-03-06 07:53:22]

Nice. lgtm

[Toon Verwaest, 2015-03-06 08:03:04]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2015-03-06 08:04:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/982793002/1

[commit-bot: I haz the power, 2015-03-06 08:37:18]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-06 08:37:34]

Patchset 1 (id:??) landed as
https://crrev.com/67d531c33c7bec956810189273ab51beae8a0727
Cr-Commit-Position: refs/heads/master@{#27034}