Revert of Add documentation to 2 DeprecatedPaintLayer objects

Revert of Add documentation to 2 DeprecatedPaintLayer objects (patchset #2 id:20001 of https://codereview.chromium.org/1327483003/ )

Reason for revert:
Speculative revert: Failed build job.

I don't know why a comment would cause a breakage but the build output shows: 

In file included from ../../third_party/WebKit/Source/core/paint/DeprecatedPaintLayer.h:50:0,
                 from ../../third_party/WebKit/Source/core/layout/svg/LayoutSVGModelObject.cpp:39:
../../third_party/WebKit/Source/core/paint/DeprecatedPaintLayerClipper.h:135:1:error: multi-line comment [-Werror=comment]
 //                /    \
 ^

Original issue's description:
> Add documentation to 2 DeprecatedPaintLayer objects
> 
> Added class level comments to DeprecatedPaintLayerClipper
> and DeprecatedPaintLayerStackingNode.
> 
> While touching DeprecatedPaintLayerStackingNode, added a comment
> about NormalFlowChildren.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201805

TBR=eae@chromium.org,mstensho@opera.com,wkorman@chromium.org,jchaffraix@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201809

[RobertoCN, 2015-09-04 17:47:50]

Created Revert of Add documentation to 2 DeprecatedPaintLayer objects

[commit-bot: I haz the power, 2015-09-04 17:47:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312203004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312203004/1

[commit-bot: I haz the power, 2015-09-04 17:48:27]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201809