Fix official builds on ios 8.3+

Fix official builds on ios 8.3+

Conditionally disable the warning based on the value of the
"xcode_version" variable. To be reverted when all bots are on 8.3.

BUG=712731
Review-Url: https://codereview.chromium.org/2833833002
Cr-Commit-Position: refs/heads/master@{#466157}
Committed: https://chromium.googlesource.com/chromium/src/+/b1eb09e2deb0335502f6b744a902dd0251a209f3

[lody, 2017-04-20 17:06:07]

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

[lody, 2017-04-20 17:06:08]

Hi Thakis, please review this change you suggested on the bug. Thank you!

[Nico, 2017-04-20 17:11:33]

lgtm

[lody, 2017-04-20 20:57:50]

The CQ bit was checked by lod@chromium.org

[commit-bot: I haz the power, 2017-04-20 20:58:38]

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, 2017-04-20 22:08:56]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492721870250950, "parent_rev":
"597f6ab23b8535ca35d128e25bb0f57398e6da37", "commit_rev":
"b1eb09e2deb0335502f6b744a902dd0251a209f3"}

[commit-bot: I haz the power, 2017-04-20 22:09:05]

Description was changed from

==========
Fix official builds on ios 8.3+

Conditionally disable the warning based on the value of the
"xcode_version" variable. To be reverted when all bots are on 8.3.

BUG=712731
==========

to

==========
Fix official builds on ios 8.3+

Conditionally disable the warning based on the value of the
"xcode_version" variable. To be reverted when all bots are on 8.3.

BUG=712731

Review-Url: https://codereview.chromium.org/2833833002
Cr-Commit-Position: refs/heads/master@{#466157}
Committed:
https://chromium.googlesource.com/chromium/src/+/b1eb09e2deb0335502f6b744a902...
==========

[commit-bot: I haz the power, 2017-04-20 22:09:07]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b1eb09e2deb0335502f6b744a902...