Revert of Mark overflow-scrollbar-combinations and its virtual equivalents as NeedsRebaseline

Revert of Mark overflow-scrollbar-combinations and its virtual equivalents as NeedsRebaseline (patchset #1 id:1 of https://codereview.chromium.org/1409203004/ )

Reason for revert:
Reason for revert:
Unneeded covered by https://codereview.chromium.org/1432933002

Original issue's description:
> Mark overflow-scrollbar-combinations and its virtual equivalents as NeedsRebaseline
>
> More fallout from https://codereview.chromium.org/1414493004. These were
> marked as NeedsRebaseline previously, but it's still failing :(
>
> BUG=553553, 532910
> TBR=noel@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/098bf9aced027bb660dc4b10679fd7f48e70aad0

TBR=leviw@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=553553, 532910
Committed: https://crrev.com/fa15bd4d2bc01708b06bd4fbef081c884cf8a2ce
Cr-Commit-Position: refs/heads/master@{#358756}

[Noel Gordon, 2015-11-10 02:18:27]

Created Revert of Mark overflow-scrollbar-combinations and its virtual
equivalents as NeedsRebaseline

[commit-bot: I haz the power, 2015-11-10 02:20:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1415633006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1415633006/1

[commit-bot: I haz the power, 2015-11-10 02:24:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-10 02:24:48]

Patchset 1 (id:??) landed as
https://crrev.com/fa15bd4d2bc01708b06bd4fbef081c884cf8a2ce
Cr-Commit-Position: refs/heads/master@{#358756}