Revert of Fix bad scaling in TiledLayer

Revert of Fix bad scaling in TiledLayer (patchset #8 id:140001 of https://codereview.chromium.org/567743003/)

Reason for revert:
This break Blink layout tests. See crbug.com/416775.

Original issue's description:
> Fix bad scaling in TiledLayer
>
> On the windows side (and likely chromeos for some devices) we can end
> up in a situation where the pixel bounds is not an even multiple of the
> scale factor. This means when TiledLayer calculates the scale it ends
> up off.
>
> BUG=416655
> TEST=added test coverage
> R=danakj@chromium.org
>
> Committed: https://crrev.com/c01746b4f7d811a5fdc75ce6570a9667b9877913
> Cr-Commit-Position: refs/heads/master@{#296108}

TBR=danakj@chromium.org,sky@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=416655
Committed: https://crrev.com/fcd74526865d5d0d127361c26459e1c0a5e16afc
Cr-Commit-Position: refs/heads/master@{#296158}

[Mads Ager (chromium), 2014-09-23 08:28:58]

Created Revert of Fix bad scaling in TiledLayer

[commit-bot: I haz the power, 2014-09-23 08:29:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/590313004/1

[commit-bot: I haz the power, 2014-09-23 08:30:55]

Committed patchset #1 (id:1) as bd16dcfa48462f90e90518e8495663ea60e18bc6

[commit-bot: I haz the power, 2014-09-23 08:31:51]

Patchset 1 (id:??) landed as
https://crrev.com/fcd74526865d5d0d127361c26459e1c0a5e16afc
Cr-Commit-Position: refs/heads/master@{#296158}