Revert of Update Blink to use the tree scope info on WebFrame for scoping checks.

Revert of Update Blink to use the tree scope info on WebFrame for scoping checks. (patchset #2 id:20001 of https://codereview.chromium.org/1141553006/)

Reason for revert:
Broke Android build.
https://build.chromium.org/p/chromium.webkit/builders/Android%20Builder%20%28dbg%29/builds/45207


Original issue's description:
> Update Blink to use the tree scope info on WebFrame for scoping checks.
> 
> This patch switches FrameTree over to using the tree scope information
> that's now tracked in WebFrame. This removes the dependency on using the
> DOM to check if a nested browsing context is in a shadow tree, so the
> scoping checks for remote frames can be re-enabled.
> 
> The rest of this change is just updating callsites for functions with
> new signatures, as well as deleting now-obsolete code.
> 
> BUG=473518
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195765

TBR=hayato@chromium.org,dcheng@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=473518
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195768

[tkent, 2015-05-22 06:53:09]

Created Revert of Update Blink to use the tree scope info on WebFrame for
scoping checks.

[commit-bot: I haz the power, 2015-05-22 06:53:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1157563004/1

[commit-bot: I haz the power, 2015-05-22 06:54:17]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195768