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

Review URL: https://codereview.chromium.org/141123003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245938 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245938