Revert of win 2015: Update the toolchain package to VS2015 RTM.

Revert of win 2015: Update the toolchain package to VS2015 RTM. (patchset #2 id:20001 of https://codereview.chromium.org/1265503002/)

Reason for revert:
It's breaking the VS2015 builder. I'm looking at it.

Original issue's description:
> win 2015: Update the toolchain package to VS2015 RTM.
>
> I've tried it locally (build Chrome with this archive on a fresh VM) and it worked well, the archive has been generated with package_from_installed.py (from depot_tools/win_toolchain)
>
> BUG=
>
> Committed: https://crrev.com/f04ff85d2b85833971ef7ca7f31f4fd5a1b1f3aa
> Cr-Commit-Position: refs/heads/master@{#340898}

TBR=brucedawson@chromium.org,thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/ff200aeebf10796f772ea5ecc61ec1be9b7cdac3
Cr-Commit-Position: refs/heads/master@{#340906}

[Sébastien Marchand, 2015-07-29 17:03:19]

Created Revert of win 2015: Update the toolchain package to VS2015 RTM.

[commit-bot: I haz the power, 2015-07-29 17:05:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1254023004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1254023004/1

[commit-bot: I haz the power, 2015-07-29 17:07:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-29 17:08:17]

Patchset 1 (id:??) landed as
https://crrev.com/ff200aeebf10796f772ea5ecc61ec1be9b7cdac3
Cr-Commit-Position: refs/heads/master@{#340906}