Merge 185075 "Revert paint-invalidation-container ASSERT"

Merge 185075 "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
> 
> Review URL: https://codereview.chromium.org/706353002

TBR=jchaffraix@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=185083

[Julien - ping for review, 2014-11-11 00:56:27]

Committed patchset #1 (id:1) manually as r185083.