Revert of Exclude readonly and disabled elements from autofill form.

Revert of Exclude readonly and disabled elements from autofill form. (patchset #3 id:40001 of https://codereview.chromium.org/621503003/)

Reason for revert:
breaks requestAutocomplete

Original issue's description:
> Exclude readonly and disabled elements from autofill form.
>
> R=isherman@chromium.org
> BUG=231160
>
> Committed: https://crrev.com/cfe1912bcc70118364c9156e1e12c6c89b1a06b9
> Cr-Commit-Position: refs/heads/master@{#298436}

TBR=isherman@chromium.org,mkwst@chromium.org,ziran.sun@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=231160
Committed: https://crrev.com/2bd42c07f44b7c5d8cdfb858c713499bb9fd120c
Cr-Commit-Position: refs/heads/master@{#299328}

[Evan Stade, 2014-10-13 18:31:03]

Created Revert of Exclude readonly and disabled elements from autofill form.

[Mike West, 2014-10-13 18:32:40]

Is there a test for the rAc functionality it breaks?

[commit-bot: I haz the power, 2014-10-13 18:32:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/652783002/1

[commit-bot: I haz the power, 2014-10-13 18:34:12]

Committed patchset #1 (id:1)

[Evan Stade, 2014-10-13 18:34:26]

On 2014/10/13 18:32:40, Mike West wrote:
> Is there a test for the rAc functionality it breaks?

there must not be, so I should add one.

[commit-bot: I haz the power, 2014-10-13 18:35:08]

Patchset 1 (id:??) landed as
https://crrev.com/2bd42c07f44b7c5d8cdfb858c713499bb9fd120c
Cr-Commit-Position: refs/heads/master@{#299328}