This is a reland of a0d2ffb6

This also relands:
https://chromium-review.googlesource.com/c/v8/v8/+/684215

Original change's description:
> [build] Switch windows default compilation to MSVS 2017
> 
> Bug: v8:6857
> Change-Id: Icab007681753c6f8143147ea8b2c1b06bf325d92
> Reviewed-on: https://chromium-review.googlesource.com/686900
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48196}

TBR=sergiyb@chromium.org

Bug: v8:6857
Change-Id: I7e8f560dbb4fcf4f937f8494fb01c802201cf236
Reviewed-on: https://chromium-review.googlesource.com/691834Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48221}

This reverts commit a0d2ffb6.

Reason for revert: Breaks CI

Original change's description:
> [build] Switch windows default compilation to MSVS 2017
> 
> Bug: v8:6857
> Change-Id: Icab007681753c6f8143147ea8b2c1b06bf325d92
> Reviewed-on: https://chromium-review.googlesource.com/686900
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48196}

TBR=machenbach@chromium.org,brucedawson@chromium.org,sergiyb@chromium.org

Change-Id: I5c961c8c28c6213014cf61ad342984193a18498e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6857
Reviewed-on: https://chromium-review.googlesource.com/690034Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48199}

Bug: v8:6857
Change-Id: Icab007681753c6f8143147ea8b2c1b06bf325d92
Reviewed-on: https://chromium-review.googlesource.com/686900
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48196}

Bug: chromium:750830
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_chromium_rel_ng;master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: Icab7b5a1c469d5e77d04df8bfca8319784e92af4
Reviewed-on: https://chromium-review.googlesource.com/595655
Commit-Queue: Julien Brianceau <jbriance@cisco.com>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47072}

BUG=670470
R=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2544053002
Cr-Commit-Position: refs/heads/master@{#41460}

BUG=chromium:603131
LOG=y

Committed: https://crrev.com/6b9c49cac101d1a373ae1a098b7959f8aff848ac
Review-Url: https://codereview.chromium.org/2533813002
Cr-Original-Commit-Position: refs/heads/master@{#41407}
Cr-Commit-Position: refs/heads/master@{#41410}

Revert of [build] Use MSVS 2015 by default. (patchset #5 id:80001 of https://codereview.chromium.org/2533813002/ )

Reason for revert:
Breaks CI dbg builder:
https://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20builder/builds/13817

Original issue's description:
> [build] Use MSVS 2015 by default.
>
> BUG=chromium:603131
> LOG=y
>
> Committed: https://crrev.com/6b9c49cac101d1a373ae1a098b7959f8aff848ac
> Cr-Commit-Position: refs/heads/master@{#41407}

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

Review-Url: https://codereview.chromium.org/2538493007
Cr-Commit-Position: refs/heads/master@{#41409}

BUG=chromium:603131
LOG=y

Review-Url: https://codereview.chromium.org/2533813002
Cr-Commit-Position: refs/heads/master@{#41407}

This prepares deletion of MB on the Chromium side.

This runs validation of the v8 configs as presubmit and
removes some obsolete code that required chromium.

BUG=chromium:616035

Review-Url: https://codereview.chromium.org/2299953002
Cr-Commit-Position: refs/heads/master@{#39082}