Revert of New PaintController under-invalidation checking

Revert of New PaintController under-invalidation checking (patchset #7 id:120001 of https://codereview.chromium.org/2114653003/ )

Reason for revert:
NOTREACHED being hit in checkUnderInvalidation on WebKit Win7 (dbg); see https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29/builds/6481.

Original issue's description:
> New PaintController under-invalidation checking
>
> This is a follow-up of https://codereview.chromium.org/2107103002/
> which broke the original under-invalidation checking in
> PaintController.
>
> BUG=596983, 510908
>
> Committed: https://crrev.com/63b12484f2c59ba177a21aba09b8a4edd38e6ea1
> Cr-Commit-Position: refs/heads/master@{#405805}

TBR=chrishtr@chromium.org,pdr@chromium.org,wangxianzhu@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=596983, 510908
Committed: https://crrev.com/f2f05c78616f02157cd1414905a8692f227d9a64
Cr-Commit-Position: refs/heads/master@{#405988}

[grt (UTC plus 2), 2016-07-18 10:53:34]

The CQ bit was checked by grt@chromium.org

[grt (UTC plus 2), 2016-07-18 10:53:35]

Created Revert of New PaintController under-invalidation checking

[commit-bot: I haz the power, 2016-07-18 10:53:48]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-18 12:27:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-18 12:27:36]

Try jobs failed on following builders:
  win_clang on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_clang/builds/...)

[grt (UTC plus 2), 2016-07-18 13:36:28]

The CQ bit was checked by grt@chromium.org

[commit-bot: I haz the power, 2016-07-18 13:36:48]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-18 14:47:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-18 14:47:34]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-18 14:51:56]

Description was changed from

==========
Revert of New PaintController under-invalidation checking (patchset #7 id:120001
of https://codereview.chromium.org/2114653003/ )

Reason for revert:
NOTREACHED being hit in checkUnderInvalidation on WebKit Win7 (dbg); see
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%....

Original issue's description:
> New PaintController under-invalidation checking
> 
> This is a follow-up of https://codereview.chromium.org/2107103002/
> which broke the original under-invalidation checking in
> PaintController.
> 
> BUG=596983,510908
> 
> Committed: https://crrev.com/63b12484f2c59ba177a21aba09b8a4edd38e6ea1
> Cr-Commit-Position: refs/heads/master@{#405805}

TBR=chrishtr@chromium.org,pdr@chromium.org,wangxianzhu@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=596983,510908
==========

to

==========
Revert of New PaintController under-invalidation checking (patchset #7 id:120001
of https://codereview.chromium.org/2114653003/ )

Reason for revert:
NOTREACHED being hit in checkUnderInvalidation on WebKit Win7 (dbg); see
https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win7%20%28dbg%....

Original issue's description:
> New PaintController under-invalidation checking
>
> This is a follow-up of https://codereview.chromium.org/2107103002/
> which broke the original under-invalidation checking in
> PaintController.
>
> BUG=596983,510908
>
> Committed: https://crrev.com/63b12484f2c59ba177a21aba09b8a4edd38e6ea1
> Cr-Commit-Position: refs/heads/master@{#405805}

TBR=chrishtr@chromium.org,pdr@chromium.org,wangxianzhu@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=596983,510908

Committed: https://crrev.com/f2f05c78616f02157cd1414905a8692f227d9a64
Cr-Commit-Position: refs/heads/master@{#405988}
==========

[commit-bot: I haz the power, 2016-07-18 14:51:57]

Patchset 1 (id:??) landed as
https://crrev.com/f2f05c78616f02157cd1414905a8692f227d9a64
Cr-Commit-Position: refs/heads/master@{#405988}

[Xianzhu, 2016-07-18 16:50:24]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2162603002/ by wangxianzhu@chromium.org.

The reason for reverting is: The original CL is to discover such bugs. Will mark
the test failure in the reland..