gin: Bug fix: Fix CreateHandle to return an emtpy handle in some extreme cases

gin: Bug fix: Fix CreateHandle to return an emtpy handle in some extreme cases

In some extreme cases, ObjectTemplate::NewInstance might return an empty
handler. For example, the getter and setter
Object.prototype.constructor can be rewritten with a evil function which
can throw exceptions.

BUG=331301
TEST=gin_unittests --gtest_filter=WrappableTest.ErrorInObjectConstructorProperty

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=254109

[hajimehoshi, 2014-02-28 08:53:56]

PTAL

[jochen (gone - plz use gerrit), 2014-02-28 09:04:18]

lgtm

[hajimehoshi, 2014-02-28 09:06:09]

The CQ bit was checked by hajimehoshi@chromium.org

[commit-bot: I haz the power, 2014-02-28 09:06:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hajimehoshi@chromium.org/184253004/20001

[commit-bot: I haz the power, 2014-02-28 10:18:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-02-28 10:18:07]

Try jobs failed on following builders: linux_chromium_rel

[hajimehoshi, 2014-02-28 10:26:16]

The CQ bit was checked by hajimehoshi@chromium.org

[commit-bot: I haz the power, 2014-02-28 10:27:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hajimehoshi@chromium.org/184253004/20001

[commit-bot: I haz the power, 2014-02-28 14:48:26]

Change committed as 254109