[CSS Grid Layout] RenderGrid methods should take RenderBox references

[CSS Grid Layout] RenderGrid methods should take RenderBox references

RenderGrid has several methods that take pointers to RenderBox
instances but the body of those methods assumes that the objects
will never be NULL. We should replace them by references.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181722

[svillar, 2014-09-09 14:59:48]

svillar@igalia.com changed reviewers:
+ eae@chromium.org, esprehn@chromium.org, jchaffraix@chromium.org

[svillar, 2014-09-09 14:59:49]

Adding some OWNERS

[Julien - ping for review, 2014-09-09 23:21:28]

The CQ bit was checked by jchaffraix@chromium.org

[Julien - ping for review, 2014-09-09 23:21:28]

rs lgtm

[commit-bot: I haz the power, 2014-09-09 23:22:23]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/svillar@igalia.com/554293003/1

[commit-bot: I haz the power, 2014-09-09 23:32:07]

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

[commit-bot: I haz the power, 2014-09-09 23:32:08]

Try jobs failed on following builders:
  mac_gpu on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu/builds/53720)

[svillar, 2014-09-10 09:17:33]

The CQ bit was checked by svillar@igalia.com

[commit-bot: I haz the power, 2014-09-10 09:17:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/svillar@igalia.com/554293003/20001

[commit-bot: I haz the power, 2014-09-10 10:18:31]

Committed patchset #2 (id:20001) as 181722