Fix switch statement in about_flags.cc to support FEATURE_VALUE.

Fix switch statement in about_flags.cc to support FEATURE_VALUE.

This was missed by my previous CL (https://codereview.chromium.org/1408783002).

BUG=544158
Committed: https://crrev.com/c153c1da7cc9322065fe2477cea081ecd4606410
Cr-Commit-Position: refs/heads/master@{#358375}

[Alexei Svitkine (slow), 2015-11-06 18:04:55]

Patchset #1 (id:1) has been deleted

[Alexei Svitkine (slow), 2015-11-06 18:05:04]

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

[Nico, 2015-11-06 18:08:33]

rs-lgtm

possible to test this?

[Alexei Svitkine (slow), 2015-11-06 18:46:18]

I think it should be possible - good idea.

Would like to land this in the mean time, since this is blocking some users from
starting to use the new API.

Filed http://crbug.com/552480 to add test coverage for this and planning to work
on that early next week.

[Alexei Svitkine (slow), 2015-11-06 18:46:23]

The CQ bit was checked by asvitkine@chromium.org

[commit-bot: I haz the power, 2015-11-06 18:46:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406023021/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406023021/20001

[commit-bot: I haz the power, 2015-11-06 20:27:24]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-11-06 20:28:02]

Patchset 1 (id:??) landed as
https://crrev.com/c153c1da7cc9322065fe2477cea081ecd4606410
Cr-Commit-Position: refs/heads/master@{#358375}