Revert of Add PassPaintVisualRectToCompositor feature flag.

Revert of Add PassPaintVisualRectToCompositor feature flag. (patchset #3 id:40001 of https://codereview.chromium.org/1410573008/ )

Reason for revert:
Tentative revert since it seems to break http://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/31016.

cc_unittests

ThreadedChannelTestCommit.RunMultiThread_DirectRenderer.

Original issue's description:
> Add PassPaintVisualRectToCompositor feature flag.
>
> BUG=529938
>
> Committed: https://crrev.com/e8cc107c99f8dea17c02c677270e4e8af3f943c7
> Cr-Commit-Position: refs/heads/master@{#357052}

TBR=chrishtr@chromium.org,pdr@chromium.org,vmpstr@chromium.org,wkorman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=529938
Committed: https://crrev.com/31fc911d634e465b22687e78195a494e5e62225c
Cr-Commit-Position: refs/heads/master@{#357072}

[perkj_chrome, 2015-10-30 10:17:31]

Created Revert of Add PassPaintVisualRectToCompositor feature flag.

[commit-bot: I haz the power, 2015-10-30 10:18:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1424783004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1424783004/1

[commit-bot: I haz the power, 2015-10-30 10:19:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-30 10:19:48]

Patchset 1 (id:??) landed as
https://crrev.com/31fc911d634e465b22687e78195a494e5e62225c
Cr-Commit-Position: refs/heads/master@{#357072}

[perkj_chrome, 2015-10-30 11:02:56]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1421873004/ by perkj@chromium.org.

The reason for reverting is: Reverting the revert. 
It turns out ThreadedChannelTestCommit.RunMultiThread_DirectRenderer is flaky
and have flaked before this cl.
Sorry for reverting and reverting the revert..