mac: Remove libc++ hack that was required by NaCl.

mac: Remove libc++ hack that was required by NaCl.

NaCl target were still built with the 10.6 SDK even after we thought we
switched the whole build to the 10.10 SDK. This was a problem in static
library ASan builds: -fsanitize=address implicitly requires libc++, so
this added a -lc++ to the link, but the 10.6 SDK doesn't contain a libc++
(since ASan requires 10.7, and since it also adds an implicit -lc++abi,
we dynamically link libc++ in ASan builds). This led to linker errors.

Now that NaCl targets build with the 10.10 SDK like everything else when
they're part of a Chromium build, the hack I used to work around this is
no longer needed, so remove it.

No intended behavior change.

BUG=400091
Committed: https://crrev.com/e1c27eab364747ef85275615835bf56514916696
Cr-Commit-Position: refs/heads/master@{#356325}

[Nico, 2015-10-27 05:38:10]

thakis@chromium.org changed reviewers:
+ mark@chromium.org

[Nico, 2015-10-27 05:38:10]

This brings trunk back to how things looked in the CL you reviewed last week. I
had to hack things up a bit to work around NaCl – this removes this workaround
again now that I've fixed things in NaCl land.

[Nico, 2015-10-27 05:44:09]

(please click through to patch set 2, i forgot something in patch set 1)

[Mark Mentovai, 2015-10-27 16:20:35]

I went all the way to patch set 4 and LGTM.

[Nico, 2015-10-27 16:27:56]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-10-27 16:28:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1414703004/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1414703004/60001

[commit-bot: I haz the power, 2015-10-27 17:23:39]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-10-27 17:24:34]

Patchset 4 (id:??) landed as
https://crrev.com/e1c27eab364747ef85275615835bf56514916696
Cr-Commit-Position: refs/heads/master@{#356325}