Revert of Changes look for scrollbars on windows

Revert of Changes look for scrollbars on windows (https://codereview.chromium.org/137533012/)

Reason for revert:
Broke webkit_unit_tests:ScrollingCoordinatorChromiumTest.rtlIframe



Original issue's description:
> Changes look for scrollbars on windows
> 
> Additionally respects the size from the OS.
> 
> BUG=333499
332937
> TEST=none
> R=sadrul@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245886

TBR=sadrul@chromium.org,jam@chromium.org,cpu@chromium.org,sky@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=333499
332937

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=245938

[jochen (gone - plz use gerrit), 2014-01-20 19:34:17]

Created Revert of Changes look for scrollbars on windows

[commit-bot: I haz the power, 2014-01-20 19:34:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jochen@chromium.org/141123003/1

[commit-bot: I haz the power, 2014-01-20 19:34:59]

Change committed as 245938