Adjust autofilled property for <search> input and <select> elements

Adjust autofilled property for <search> input and <select> elements

Set value of autofilled property to false in the following cases:
  - Cancel search via cancel button in <search> element.
  - Delete autofilled selected <select> option.

This patch also
  - Merged test case for editing text in autofilled textarea.

R=tkent@chromium.org
BUG=395627
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181589

[ziran.sun, 2014-09-08 12:27:12]

Resubmit the previously previewed patch at -

https://codereview.chromium.org/471803003/

Resubmitted because locally tests on Android run successfully.

[tkent, 2014-09-08 23:14:36]

The CQ bit was checked by tkent@chromium.org

[tkent, 2014-09-08 23:14:36]

lgtm

[commit-bot: I haz the power, 2014-09-08 23:15:53]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ziran.sun@samsung.com/537393002/20001

[commit-bot: I haz the power, 2014-09-09 00:17:41]

Committed patchset #2 (id:20001) as 181589