Cleanup and add NOTREACHED to supplementaryView method.

Cleanup and add NOTREACHED to supplementaryView method.

Fixes an error reported by returning nil as a supplementary view must be
returned from this method.

BUG=648970
Review-Url: https://codereview.chromium.org/2663323002
Cr-Commit-Position: refs/heads/master@{#448255}
Committed: https://chromium.googlesource.com/chromium/src/+/7348c2e83d2be803c1142f0842f28b295d4bd152

[michaeldo, 2017-01-31 22:32:44]

michaeldo@chromium.org changed reviewers:
+ rohitrao@chromium.org

[michaeldo, 2017-02-03 17:41:51]

On 2017/01/31 22:32:45, michaeldo wrote:

PTAL

[rohitrao (ping after 24h), 2017-02-06 13:50:03]

lgtm

[michaeldo1, 2017-02-06 15:19:46]

The CQ bit was checked by michaeldo@google.com

[commit-bot: I haz the power, 2017-02-06 15:19:58]

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, 2017-02-06 15:29:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486394386845180, "parent_rev":
"bcd1a031bcd2e935901d83520339bcb089b57496", "commit_rev":
"7348c2e83d2be803c1142f0842f28b295d4bd152"}

[commit-bot: I haz the power, 2017-02-06 15:30:22]

Description was changed from

==========
Cleanup and add NOTREACHED to supplementaryView method.

Fixes an error reported by returning nil as a supplementary view must be
returned from this method.

BUG=648970
==========

to

==========
Cleanup and add NOTREACHED to supplementaryView method.

Fixes an error reported by returning nil as a supplementary view must be
returned from this method.

BUG=648970

Review-Url: https://codereview.chromium.org/2663323002
Cr-Commit-Position: refs/heads/master@{#448255}
Committed:
https://chromium.googlesource.com/chromium/src/+/7348c2e83d2be803c1142f0842f2...
==========

[commit-bot: I haz the power, 2017-02-06 15:30:23]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/7348c2e83d2be803c1142f0842f2...