[Autofill] Don't save autocomplete text entered into fields with autocomplete="off"

[Autofill] Don't save autocomplete text entered into fields with autocomplete="off"

This fixes a regression introduced in [ https://codereview.chromium.org/407083002 ].

BUG=423326
TEST=components_unittests
R=estade@chromium.org

Committed: https://crrev.com/dddf9472afb434be7695edbabffd734d3ac60997
Cr-Commit-Position: refs/heads/master@{#301985}

[Evan Stade, 2014-10-29 22:34:38]

lgtm

[Ilya Sherman, 2014-10-29 22:36:07]

The CQ bit was checked by isherman@chromium.org

[commit-bot: I haz the power, 2014-10-29 22:38:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/688543002/1

[commit-bot: I haz the power, 2014-10-30 00:07:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-30 00:08:33]

Patchset 1 (id:??) landed as
https://crrev.com/dddf9472afb434be7695edbabffd734d3ac60997
Cr-Commit-Position: refs/heads/master@{#301985}