Revert of Enable slimming paint synchronized painting

Revert of Enable slimming paint synchronized painting (patchset #2 id:20001 of https://codereview.chromium.org/1467793002/ )

Reason for revert:
Sorry, but looks like this is causing crashes on the Linux perf bot:

https://build.chromium.org/p/chromium.perf/builders/Linux%20Perf%20%282%29/builds/10896/steps/rasterize_and_record_micro.key_silk_cases/logs/stdio

(Verified locally that reverting fixes the crash.)

Original issue's description:
> Enable slimming paint synchronized painting
>
> BUG=536999, 548528
>
> Committed: https://crrev.com/c2fae545625e19ceed438e9850ec194d9574a9b2
> Cr-Commit-Position: refs/heads/master@{#361570}

TBR=chrishtr@chromium.org,wangxianzhu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=536999, 548528
Committed: https://crrev.com/22aa445bafda8fbf2e4436327bc2ecc68902a15b
Cr-Commit-Position: refs/heads/master@{#361643}

[Sami, 2015-11-25 13:48:30]

Created Revert of Enable slimming paint synchronized painting

[commit-bot: I haz the power, 2015-11-25 13:48:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1472243003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1472243003/1

[commit-bot: I haz the power, 2015-11-25 13:49:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-25 13:50:27]

Patchset 1 (id:??) landed as
https://crrev.com/22aa445bafda8fbf2e4436327bc2ecc68902a15b
Cr-Commit-Position: refs/heads/master@{#361643}