Revert paint-invalidation-container ASSERT

Revert paint-invalidation-container ASSERT

This CL reverts
https://codereview.chromium.org/414503002

The RenderLayer change was wrong and is the cause of the regression.
Unfortunately it's unclear what the path forward is: the ASSERT is
triggering, which means there are some bugs in the code, but it is
caused by having several definitions of paint invalidation container.
Fixing it will require aligning these definitions and it's unclear
which one is right.

BUG=415513
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185075

[Julien - ping for review, 2014-11-10 16:27:41]

jchaffraix@chromium.org changed reviewers:
+ dsinclair@chromium.org, wangxianzhu@chromium.org

[dsinclair, 2014-11-10 16:39:12]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2014-11-10 16:39:13]

lgtm

[commit-bot: I haz the power, 2014-11-10 16:40:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/706353002/1

[commit-bot: I haz the power, 2014-11-10 22:09:27]

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

[commit-bot: I haz the power, 2014-11-10 22:09:28]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/30207)

[Julien - ping for review, 2014-11-10 22:25:23]

The CQ bit was checked by jchaffraix@chromium.org

[commit-bot: I haz the power, 2014-11-10 22:25:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/706353002/20001

[commit-bot: I haz the power, 2014-11-11 00:11:12]

Committed patchset #2 (id:20001) as 185075