Replace nextSiblingChildren() with simpler nextSibling() when equivalent

Replace nextSiblingChildren() with simpler nextSibling() when equivalent

This makes the code more readable as it makes it clear we are only traversing
children. This is also a bit more efficient as nextSiblingChildren() tries to
traverse the ancestors siblings when done with the current siblings.

R=esprehn, adamk

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169614

[Inactive, 2014-03-20 02:28:10]

PTAL

[esprehn, 2014-03-20 02:34:48]

lgtm

[Inactive, 2014-03-20 02:44:30]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-03-20 02:44:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/196823006/1

[commit-bot: I haz the power, 2014-03-20 04:12:19]

Change committed as 169614