Switch Windows over to BoringSSL from NSS.

Switch Windows over to BoringSSL from NSS.

This is a reland of https://crrev.com/306358 which was reverted
because it broke the Windows GN build.

This is a much much larger change than the diff suggests. If it
breaks something, please revert first and ask questions later.

BUG=338884
Committed: https://crrev.com/dcbcbd479e2b6effd7bbbb77a01853aa190442ba
Cr-Commit-Position: refs/heads/master@{#306659}

[davidben, 2014-12-02 22:37:29]

davidben@chromium.org changed reviewers:
+ rsleevi@chromium.org

[davidben, 2014-12-02 23:03:41]

This is TBR'd since it's the same as https://codereview.chromium.org/765603002/
but for BUILD.gn fixes. I won't CQ it until try jobs are green and probably not
until tomorrow morning though.

The original CL also broke Windows + Clang, but that was fixed with a BoringSSL
roll.

[Ryan Sleevi, 2014-12-03 14:00:38]

lgtm

[brettw, 2014-12-03 17:45:54]

lgtm

[davidben, 2014-12-03 18:06:20]

The CQ bit was checked by davidben@chromium.org

[commit-bot: I haz the power, 2014-12-03 18:07:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/776643003/20001

[commit-bot: I haz the power, 2014-12-03 20:08:54]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-03 20:09:41]

Patchset 2 (id:??) landed as
https://crrev.com/dcbcbd479e2b6effd7bbbb77a01853aa190442ba
Cr-Commit-Position: refs/heads/master@{#306659}