Fix build break on Mac SDK 10.12.

Fix build break on Mac SDK 10.12.

BUG=705176, 685252
Review-Url: https://codereview.chromium.org/2769353004
Cr-Commit-Position: refs/heads/master@{#459686}
Committed: https://chromium.googlesource.com/chromium/src/+/3c1d1f31c293867ecd7f90d60419e5a13d503408

[Avi (use Gerrit), 2017-03-25 01:02:41]

The CQ bit was checked by avi@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-03-25 01:03:16]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Avi (use Gerrit), 2017-03-25 01:03:42]

avi@chromium.org changed reviewers:
+ lanwei@chromium.org

[commit-bot: I haz the power, 2017-03-25 01:35:34]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-25 01:35:35]

Dry run: This issue passed the CQ dry run.

[lanwei, 2017-03-27 00:58:09]

On 2017/03/25 01:03:42, Avi wrote:

LGTM, thanks! Sorry, I thought it also takes an enum number.

[lanwei, 2017-03-27 00:58:20]

The CQ bit was checked by lanwei@chromium.org

[commit-bot: I haz the power, 2017-03-27 00:58:40]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-27 01:17:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490576300814940, "parent_rev":
"bba05f44fe583ffa69c22d36f91aaebe0ceea282", "commit_rev":
"3c1d1f31c293867ecd7f90d60419e5a13d503408"}

[commit-bot: I haz the power, 2017-03-27 01:19:41]

Description was changed from

==========
Fix build break on Mac SDK 10.12.

BUG=705176,685252
==========

to

==========
Fix build break on Mac SDK 10.12.

BUG=705176,685252

Review-Url: https://codereview.chromium.org/2769353004
Cr-Commit-Position: refs/heads/master@{#459686}
Committed:
https://chromium.googlesource.com/chromium/src/+/3c1d1f31c293867ecd7f90d60419...
==========

[commit-bot: I haz the power, 2017-03-27 01:19:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3c1d1f31c293867ecd7f90d60419...