Switch Mac over to BoringSSL from NSS.

Switch Mac over to BoringSSL from NSS.

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

BUG=338885
Committed: https://crrev.com/dd7edfa679492a6feb3ef2e1630f05da82a1b31f
Cr-Commit-Position: refs/heads/master@{#294233}

[davidben, 2014-09-04 17:24:13]

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

[davidben, 2014-09-04 17:24:14]

brettw for gn changes.
rsleevi for overall review/approval to flip this.

I'll ping the TPMs before landing this, and send a PSA to chromium-dev when it
does land.

The one missing feature I know of is SSLKEYLOGFILE, but that's a small BoringSSL
fixup (https://boringssl-review.googlesource.com/#/c/1720/), a roll, and
https://codereview.chromium.org/537633003/ away, so that should easily land
before we actually cut a branch. In the meantime, probably better to get this
ball rolling and have it flipped on trunk as well in advance of branch point as
we can manage.

[Ryan Sleevi, 2014-09-04 17:48:30]

Woo! LGTM!

[davidben, 2014-09-04 17:58:32]

(agl: FYI)

[brettw, 2014-09-04 21:03:51]

lgtm

[davidben, 2014-09-04 21:41:26]

Alright. Sounds like the plan is to land this early next week, right after the
next dev channel cut. So this CL will stay in limbo until then.

[davidben, 2014-09-10 20:07:28]

The CQ bit was checked by davidben@chromium.org

[davidben, 2014-09-10 20:16:24]

The CQ bit was unchecked by davidben@chromium.org

[davidben, 2014-09-10 20:16:28]

The CQ bit was checked by davidben@chromium.org

[commit-bot: I haz the power, 2014-09-10 20:17:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/davidben@chromium.org/539163002/1

[commit-bot: I haz the power, 2014-09-10 21:21:25]

Committed patchset #1 (id:1) as bb03e310117eed7e930ac6f58b30000fb6b67b70

[commit-bot: I haz the power, 2014-09-10 21:27:11]

Patchset 1 (id:??) landed as
https://crrev.com/dd7edfa679492a6feb3ef2e1630f05da82a1b31f
Cr-Commit-Position: refs/heads/master@{#294233}

[davidben, 2014-09-10 21:47:55]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/565473002/ by davidben@chromium.org.

The reason for reverting is:
http://build.chromium.org/p/chromium.memory/builders/Mac%20ASan%2064%20Builde....