Ensure that v8 arrays are always converted to object vars when allowed.

Ensure that v8 arrays are always converted to object vars when allowed.

To maintain synchronous scripting backward compatibility, v8 arrays should
always be converted to object vars when allowed. I have added a comment
explaining the conversion of objects in more detail.

This CL also adds a check to ensure that when we convert an object var to
a v8 value that it is never nested inside of an array or dictionary. Before
we switched from NPObject to gin, this was never possible so there is no
need to add this functionality now and we should restrict this case from
ever happening.

BUG=411445
Committed: https://crrev.com/b918671e294f8ce830b5cb35ec09ecac95d3565a
Cr-Commit-Position: refs/heads/master@{#294785}

[raymes, 2014-09-11 01:18:28]

raymes@chromium.org changed reviewers:
+ dmichael@chromium.org

[yzshen1, 2014-09-12 00:02:06]

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

[yzshen1, 2014-09-12 00:02:07]

LGTM

(David: Raymes pinged me since it seems you don't have time today.)

[dmichael (off chromium), 2014-09-12 18:59:21]

lgtm, sorry I missed this yesterday

[raymes, 2014-09-15 03:23:09]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2014-09-15 03:23:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/566463002/1

[commit-bot: I haz the power, 2014-09-15 04:42:03]

Committed patchset #1 (id:1) as 6dff5feb86f43f56ac986cb6b6f9e6ee496235b8

[commit-bot: I haz the power, 2014-09-15 04:47:46]

Patchset 1 (id:??) landed as
https://crrev.com/b918671e294f8ce830b5cb35ec09ecac95d3565a
Cr-Commit-Position: refs/heads/master@{#294785}