Store i18n meta data in hidden symbols instead of js accessible properties

Store i18n meta data in hidden symbols instead of js accessible properties

There were some tests that are supposed to protect against js messing
with the meta data, however, they just didn't try hard enough.

BUG=354967
R=dcarney@chromium.org
LOG=y

Committed: https://code.google.com/p/v8/source/detail?r=20375

Committed: https://code.google.com/p/v8/source/detail?r=20388

[dcarney, 2014-04-01 06:51:30]

On 2014/03/31 20:53:33, jochen wrote:

use private symbols?

lgtm

[jochen (gone - plz use gerrit), 2014-04-01 07:21:15]

Committed patchset #1 manually as r20375 (presubmit successful).

[dcarney, 2014-04-01 10:54:19]

lgtm

[jochen (gone - plz use gerrit), 2014-04-01 10:56:26]

Committed patchset #2 manually as r20388 (presubmit successful).