Binding: Remove unnecessary setObjectGroupId from visitDOMWrapper

Binding: Remove unnecessary setObjectGroupId from visitDOMWrapper

I believe the setObjectGroupId is unnecessary.

- Regarding [SetWrapperReferenceTo], it shouldn't be necessary because [SetWrapperReferenceTo] doesn't create any object group id.

- Regarding [SetWrapperReferenceFrom], setObjectGroupId is called only when the C++ reachable function returns null (e.g., NodeList::owner() returns null). In this case, it shouldn't be necessary to create an object id for the NodeList.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198043

[haraken, 2015-06-30 05:57:39]

haraken@chromium.org changed reviewers:
+ jochen@chromium.org

[haraken, 2015-06-30 05:58:11]

PTAL. Bots looks happy.

[jochen (gone - plz use gerrit), 2015-06-30 08:16:00]

lgtm

[haraken, 2015-06-30 08:16:17]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2015-06-30 08:16:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1214903006/1

[commit-bot: I haz the power, 2015-06-30 09:10:05]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198043