gn: Update clang_version when using ToT Clang

gn: Update clang_version when using ToT Clang

Tip-of-tree Clang is now at 4.0.0.

BUG=none

Committed: https://crrev.com/30c4ca0b7409fe9dcd2d399fbb30a5e0c1fc76ee
Cr-Commit-Position: refs/heads/master@{#409080}

[hans, 2016-08-01 21:28:09]

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

[hans, 2016-08-01 21:28:09]

Please take a look.

Ideally we'd like to shell out to "update.py --print-clang-version" for this,
but that's not allowed in this .gni file.

etienneb: fyi since clang_version feeds into paths for the asan libraries.

[Nico, 2016-08-01 21:30:27]

lgtm

[hans, 2016-08-01 21:31:59]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2016-08-01 21:32:14]

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, 2016-08-01 22:39:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-01 22:41:17]

Description was changed from

==========
gn: Update clang_version when using ToT Clang

Tip-of-tree Clang is now at 4.0.0.

BUG=none
==========

to

==========
gn: Update clang_version when using ToT Clang

Tip-of-tree Clang is now at 4.0.0.

BUG=none

Committed: https://crrev.com/30c4ca0b7409fe9dcd2d399fbb30a5e0c1fc76ee
Cr-Commit-Position: refs/heads/master@{#409080}
==========

[commit-bot: I haz the power, 2016-08-01 22:41:18]

Patchset 1 (id:??) landed as
https://crrev.com/30c4ca0b7409fe9dcd2d399fbb30a5e0c1fc76ee
Cr-Commit-Position: refs/heads/master@{#409080}