Reland of moved unused CascadeOrder.

Reland of moved unused CascadeOrder. (patchset #1 id:1 of https://codereview.chromium.org/1306693007/ )

Reason for revert:
I don't think this contributes any of "too many opened files".
(as is commented bay jianli
https://code.google.com/p/chromium/issues/detail?id=524248#c7 )

Will revert and reland the original patch.



Original issue's description:
> Revert of Removed unused CascadeOrder. (patchset #1 id:1 of https://codereview.chromium.org/1291873005/ )
> 
> Reason for revert:
> Speculative revert for causing "Too many opened files in the system".
> 
> https://code.google.com/p/chromium/issues/detail?id=523598
> 
> 
> Original issue's description:
> > Removed unused CascadeOrder.
> > 
> > CascadeOrder is always ignoreCascadeOrder after [1] and can be removed.
> > 
> > [1] https://codereview.chromium.org/1298173004
> > 
> > BUG=487125
> > 
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201019
> 
> TBR=kochi@chromium.org,rune@opera.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=487125
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201082

TBR=rune@opera.com,jianli@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=487125
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201092

[kochi, 2015-08-25 02:46:44]

Created Reland of moved unused CascadeOrder.

[commit-bot: I haz the power, 2015-08-25 02:46:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1313713005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1313713005/1

[commit-bot: I haz the power, 2015-08-25 02:47:31]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201092