Add a death test to check field trial creation before FieldTrialList.

Add a death test to check field trial creation before FieldTrialList.

Adds a CHECK to the production code since our memory bots don't like
a crash on a null deref, even in a death test.

BUG=123063
Committed: https://crrev.com/27b35fc08622adba5ad7949d7a345ca61b271b89
Cr-Commit-Position: refs/heads/master@{#300979}

[Alexei Svitkine (slow), 2014-10-23 19:50:38]

asvitkine@chromium.org changed reviewers:
+ mpearson@chromium.org

[Mark P, 2014-10-23 21:19:51]

lgtm
I'm impressed that you got around to following up on this.

--mark

[Alexei Svitkine (slow), 2014-10-23 21:20:43]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2014-10-23 21:22:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/678493002/1

[commit-bot: I haz the power, 2014-10-23 23:35:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-23 23:35:36]

Patchset 1 (id:??) landed as
https://crrev.com/27b35fc08622adba5ad7949d7a345ca61b271b89
Cr-Commit-Position: refs/heads/master@{#300979}