Revert of Reapply 169354 "DevTools: track stylesheets by document, not local frame" (https://codereview.chromium.org/202623003/)

Reason for revert:
Seems like there are more failures.

Original issue's description:
> Reapply 169354 "DevTools: track stylesheets by document, not local frame"
> 
> BUG= 353257
> TBR=vsevik
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169413

TBR=vsevik@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG= 353257

Review URL: https://codereview.chromium.org/203113002

git-svn-id: svn://svn.chromium.org/blink/trunk@169420 bbb929c8-8fbe-4397-9dbb-9b2b20218538