Revert of [build] Use MSVS 2015 by default.

Revert of [build] Use MSVS 2015 by default. (patchset #4 id:60001 of https://codereview.chromium.org/1886983002/ )

Reason for revert:
Introduced flaky crashes on win debug.

Original issue's description:
> [build] Use MSVS 2015 by default.
>
> BUG=chromium:603131
> LOG=y
>
> Committed: https://crrev.com/e51e8b4ad77008ec7f88c144853e01001dbea900
> Cr-Commit-Position: refs/heads/master@{#35487}

TBR=jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:603131
Committed: https://crrev.com/290ee88f63a3b94d87483dbd71ab9f581349ddc6
Cr-Commit-Position: refs/heads/master@{#35498}

[Michael Achenbach, 2016-04-14 14:52:53]

Created Revert of [build] Use MSVS 2015 by default.

[commit-bot: I haz the power, 2016-04-14 14:53:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1890873002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1890873002/1

[commit-bot: I haz the power, 2016-04-14 14:53:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-14 14:54:11]

Description was changed from

==========
Revert of [build] Use MSVS 2015 by default. (patchset #4 id:60001 of
https://codereview.chromium.org/1886983002/ )

Reason for revert:
Introduced flaky crashes on win debug.

Original issue's description:
> [build] Use MSVS 2015 by default.
> 
> BUG=chromium:603131
> LOG=y
> 
> Committed: https://crrev.com/e51e8b4ad77008ec7f88c144853e01001dbea900
> Cr-Commit-Position: refs/heads/master@{#35487}

TBR=jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:603131
==========

to

==========
Revert of [build] Use MSVS 2015 by default. (patchset #4 id:60001 of
https://codereview.chromium.org/1886983002/ )

Reason for revert:
Introduced flaky crashes on win debug.

Original issue's description:
> [build] Use MSVS 2015 by default.
>
> BUG=chromium:603131
> LOG=y
>
> Committed: https://crrev.com/e51e8b4ad77008ec7f88c144853e01001dbea900
> Cr-Commit-Position: refs/heads/master@{#35487}

TBR=jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:603131

Committed: https://crrev.com/290ee88f63a3b94d87483dbd71ab9f581349ddc6
Cr-Commit-Position: refs/heads/master@{#35498}
==========

[commit-bot: I haz the power, 2016-04-14 14:54:11]

Patchset 1 (id:??) landed as
https://crrev.com/290ee88f63a3b94d87483dbd71ab9f581349ddc6
Cr-Commit-Position: refs/heads/master@{#35498}