Remove dead code in Autofill.

Remove dead code in Autofill.

This line can't be reached because it's already guarded by a check to IsAutofillable().

Also, change a method signature to take a const ref.

BUG=none

Committed: https://crrev.com/8ac2ad2945de828afa49435357d5c4f1f59f4387
Cr-Commit-Position: refs/heads/master@{#292724}

[Evan Stade, 2014-08-28 01:19:02]

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

[Evan Stade, 2014-08-29 17:23:48]

ping

[Evan Stade, 2014-08-29 17:49:39]

On 2014/08/29 17:23:48, Evan Stade wrote:
> ping

hmm, I guess the "changed reviewers" message doesn't actually send an email? I
assumed it would. So, s/ping/ptal.

[Ilya Sherman, 2014-08-29 17:52:19]

LGTM, thanks.

[Evan Stade, 2014-08-29 18:05:34]

The CQ bit was checked by estade@chromium.org

[commit-bot: I haz the power, 2014-08-29 18:06:40]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/estade@chromium.org/512993002/20001

[commit-bot: I haz the power, 2014-08-30 00:02:47]

Committed patchset #2 (id:20001) as ba67085532088fc44dcb5a9125dd5a4138be7f4e

[commit-bot: I haz the power, 2014-09-10 03:11:59]

Patchset 2 (id:??) landed as
https://crrev.com/8ac2ad2945de828afa49435357d5c4f1f59f4387
Cr-Commit-Position: refs/heads/master@{#292724}