Revert of Disable CALayer overlays on 10.9

Revert of Disable CALayer overlays on 10.9 (patchset #2 id:20001 of https://codereview.chromium.org/1819193002/ )

Reason for revert:
Wasn't helpful.

Original issue's description:
> Disable CALayer overlays on 10.9
>
> This is causing issues with PDF and print-preview for yet-unknown
> reasons. Hopefully we can re-enable CALayer overlays when we find the
> fix.
>
> BUG=594343
>
> Committed: https://crrev.com/52dd784270ee9386ceba4e29c198c86dea9912dc
> Cr-Commit-Position: refs/heads/master@{#382498}

TBR=erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=594343
Committed: https://crrev.com/09b6b31bbf4dc3de1ac5f8e31de9fabdd2e9f427
Cr-Commit-Position: refs/heads/master@{#382943}

[ccameron, 2016-03-23 21:41:28]

Created Revert of Disable CALayer overlays on 10.9

[commit-bot: I haz the power, 2016-03-23 21:41:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1830733003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1830733003/1

[erikchen, 2016-03-23 21:49:54]

lgtm

[commit-bot: I haz the power, 2016-03-23 22:01:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1830733003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1830733003/1

[commit-bot: I haz the power, 2016-03-23 22:20:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-23 22:22:54]

Description was changed from

==========
Revert of Disable CALayer overlays on 10.9 (patchset #2 id:20001 of
https://codereview.chromium.org/1819193002/ )

Reason for revert:
Wasn't helpful.

Original issue's description:
> Disable CALayer overlays on 10.9
> 
> This is causing issues with PDF and print-preview for yet-unknown
> reasons. Hopefully we can re-enable CALayer overlays when we find the
> fix.
> 
> BUG=594343
> 
> Committed: https://crrev.com/52dd784270ee9386ceba4e29c198c86dea9912dc
> Cr-Commit-Position: refs/heads/master@{#382498}

TBR=erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=594343
==========

to

==========
Revert of Disable CALayer overlays on 10.9 (patchset #2 id:20001 of
https://codereview.chromium.org/1819193002/ )

Reason for revert:
Wasn't helpful.

Original issue's description:
> Disable CALayer overlays on 10.9
>
> This is causing issues with PDF and print-preview for yet-unknown
> reasons. Hopefully we can re-enable CALayer overlays when we find the
> fix.
>
> BUG=594343
>
> Committed: https://crrev.com/52dd784270ee9386ceba4e29c198c86dea9912dc
> Cr-Commit-Position: refs/heads/master@{#382498}

TBR=erikchen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=594343

Committed: https://crrev.com/09b6b31bbf4dc3de1ac5f8e31de9fabdd2e9f427
Cr-Commit-Position: refs/heads/master@{#382943}
==========

[commit-bot: I haz the power, 2016-03-23 22:22:55]

Patchset 1 (id:??) landed as
https://crrev.com/09b6b31bbf4dc3de1ac5f8e31de9fabdd2e9f427
Cr-Commit-Position: refs/heads/master@{#382943}