Update autocomplete dropdown when datalist changes.

Update autocomplete dropdown when datalist changes.

Blink side: https://codereview.chromium.org/799893004

BUG=428790
Committed: https://crrev.com/df5088a6ccb3cb106ddf321dfb9aaa3329700783
Cr-Commit-Position: refs/heads/master@{#308305}

[Evan Stade, 2014-12-13 02:31:57]

estade@chromium.org changed reviewers:
+ tkent@chromium.org

[Evan Stade, 2014-12-13 02:32:22]

I could not repro the perf regression locally, but it's my hope that the early
returns here will prevent the same regression from happening a second time.

[tkent, 2014-12-15 01:10:36]

lgtm

[tkent, 2014-12-15 01:11:06]

The CQ bit was checked by tkent@chromium.org

[tkent, 2014-12-15 01:11:11]

The CQ bit was unchecked by tkent@chromium.org

[tkent, 2014-12-15 01:11:26]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-12-15 01:12:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/798073003/1

[commit-bot: I haz the power, 2014-12-15 02:04:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-15 02:04:58]

Patchset 1 (id:??) landed as
https://crrev.com/df5088a6ccb3cb106ddf321dfb9aaa3329700783
Cr-Commit-Position: refs/heads/master@{#308305}