cc: Remove LayerImpl::SetContentBounds()

cc: Remove LayerImpl::SetContentBounds()

The method is now empty, remove all callsites, which are by far
mostly all tests at this point.

R=enne, vmpstr
BUG=413479
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/3b8b2bf9055bcfe082caab8d62e2162db3f78a00
Cr-Commit-Position: refs/heads/master@{#334989}

[enne (OOO), 2015-06-17 23:13:21]

lgtm

[danakj, 2015-06-18 01:36:21]

The CQ bit was checked by danakj@chromium.org

[danakj, 2015-06-18 01:36:22]

The patchset sent to the CQ was uploaded after l-g-t-m from enne@chromium.org
Link to the patchset: https://codereview.chromium.org/1180073015/#ps20001
(title: "rm-setcontentbounds: .")

[commit-bot: I haz the power, 2015-06-18 01:39:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1180073015/20001

[commit-bot: I haz the power, 2015-06-18 03:09:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-18 03:11:00]

Patchset 2 (id:??) landed as
https://crrev.com/3b8b2bf9055bcfe082caab8d62e2162db3f78a00
Cr-Commit-Position: refs/heads/master@{#334989}