Revert of win: Update to Win 10 SDK

Revert of win: Update to Win 10 SDK (patchset #8 id:140001 of https://codereview.chromium.org/1378153003/ )

Reason for revert:
This is a suspect in breaking Win bots (e.g. here http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Win%20Builder/builds/93039)

Original issue's description:
> win: Update to Win 10 SDK
>
> Tested on clean Win7 VM against both VS2013 and clang=1 at 247874-1.
>
> R=brucedawson@chromium.org
> BUG=491424
>
> Committed: https://crrev.com/3f6f89251dc210b24a36398237d374a87d4a3b33
> Cr-Commit-Position: refs/heads/master@{#352667}
>
> Committed: https://crrev.com/1feffb4b7b1c2bfaf112a8993ae7ab0c16a52da9
> Cr-Commit-Position: refs/heads/master@{#356373}

TBR=brucedawson@chromium.org,sky@chromium.org,scottmg@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=491424
Committed: https://crrev.com/e4a933bfce1dce211b29c392a681513a9d69a85c
Cr-Commit-Position: refs/heads/master@{#356484}

[caseq, 2015-10-28 01:49:28]

Created Revert of win: Update to Win 10 SDK

[commit-bot: I haz the power, 2015-10-28 01:50:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1410153007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1410153007/1

[commit-bot: I haz the power, 2015-10-28 01:52:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-28 01:54:07]

Patchset 1 (id:??) landed as
https://crrev.com/e4a933bfce1dce211b29c392a681513a9d69a85c
Cr-Commit-Position: refs/heads/master@{#356484}

[scottmg, 2015-10-28 16:53:58]

On 2015/10/28 01:54:07, commit-bot: I haz the power wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/e4a933bfce1dce211b29c392a681513a9d69a85c
> Cr-Commit-Position: refs/heads/master@{#356484}

Thanks. More Vista builders. Grrrreat. :(

[scottmg, 2015-12-04 18:40:19]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1502563003/ by scottmg@chromium.org.

The reason for reverting is: Relanding, we think all bots are updated now..