Revert of Allow Windows to use system Vsync for a single window each swap (patchset #2 id:20001 of https://codereview.chromium.org/708483003/)

Reason for revert:
Possibly introduced regressions into smoothness.tough_scrolling_cases

https://code.google.com/p/chromium/issues/detail?id=431599

Original issue's description:
> Allow Windows to use system Vsync for a single window each swap
>
> This makes the common case (one browser window) smoother, but doesn't
> help multi-window smoothness much.
>
> BUG=422000
>
> Committed: https://crrev.com/3f72599ead7c0ee7922afedf93ffae17f5f45f88
> Cr-Commit-Position: refs/heads/master@{#303074}

TBR=brianderson@chromium.org,jbauman@chromium.org,kbr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=422000

Review URL: https://codereview.chromium.org/710393003

Cr-Commit-Position: refs/heads/master@{#303759}
6 files changed