Add ubsan bug reference to GN build.

Add ubsan bug reference to GN build.

ubsan is not supported.

TBR=dpranke

Committed: https://crrev.com/8c0528e49adf32b5255c433bb135a2139e7c9ae7
Cr-Commit-Position: refs/heads/master@{#347003}

[brettw, 2015-09-02 19:18:30]

brettw@chromium.org changed reviewers:
+ dpranke@chromium.org

[brettw, 2015-09-02 19:18:38]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-09-02 19:19:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1330523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1330523002/1

[commit-bot: I haz the power, 2015-09-02 19:50:41]

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

[commit-bot: I haz the power, 2015-09-02 19:50:42]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[brettw, 2015-09-02 19:59:51]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-09-02 20:00:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1330523002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1330523002/1

[Dirk Pranke, 2015-09-02 20:06:14]

lgtm

[commit-bot: I haz the power, 2015-09-02 20:10:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-02 20:11:30]

Patchset 1 (id:??) landed as
https://crrev.com/8c0528e49adf32b5255c433bb135a2139e7c9ae7
Cr-Commit-Position: refs/heads/master@{#347003}