[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

Direct access to LayoutPart is deprecated and being removed soon. The
replacement is LayoutPartItem, which routes methods through the new
block layout API. (See linked crbug for details.) This means the
ownerLayoutObject() method is also deprecated, to be replaced with
ownerLayoutItem().

There are no functional changes.

BUG=499321
TBR=eae@chromium.org

Committed: https://crrev.com/385879bea4f921fdb634344e4537d7480ca61451
Cr-Commit-Position: refs/heads/master@{#418962}

[pilgrim_google, 2016-09-13 19:02:18]

The CQ bit was checked by pilgrim@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-13 19:02:50]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-13 20:20:33]

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

[commit-bot: I haz the power, 2016-09-13 20:20:34]

Dry run: This issue passed the CQ dry run.

[eae, 2016-09-15 09:22:39]

LGTM

[pilgrim_google, 2016-09-15 16:45:10]

The CQ bit was checked by pilgrim@chromium.org

[commit-bot: I haz the power, 2016-09-15 16:45:27]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-15 20:46:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-15 20:50:20]

Description was changed from

==========
[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

Direct access to LayoutPart is deprecated and being removed soon. The
replacement is LayoutPartItem, which routes methods through the new
block layout API. (See linked crbug for details.) This means the
ownerLayoutObject() method is also deprecated, to be replaced with
ownerLayoutItem().

There are no functional changes.

BUG=499321
TBR=eae@chromium.org
==========

to

==========
[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

Direct access to LayoutPart is deprecated and being removed soon. The
replacement is LayoutPartItem, which routes methods through the new
block layout API. (See linked crbug for details.) This means the
ownerLayoutObject() method is also deprecated, to be replaced with
ownerLayoutItem().

There are no functional changes.

BUG=499321
TBR=eae@chromium.org

Committed: https://crrev.com/385879bea4f921fdb634344e4537d7480ca61451
Cr-Commit-Position: refs/heads/master@{#418962}
==========

[commit-bot: I haz the power, 2016-09-15 20:50:21]

Patchset 1 (id:??) landed as
https://crrev.com/385879bea4f921fdb634344e4537d7480ca61451
Cr-Commit-Position: refs/heads/master@{#418962}