[Password Manager Automated tests] Fix enabling the password manager

[Password Manager Automated tests] Fix enabling the password manager

This changes the code for enabling password manager in chrome://settings.
Currently, it only changes the .checked property of the associated checkbox.
That does not trigger the update in preferences, one has to .click() the checkbox.

BUG=369521
Committed: https://crrev.com/e7da8d59282723d86026ab74ec244b599df5a12c
Cr-Commit-Position: refs/heads/master@{#322597}

[vabr (Chromium), 2015-03-27 16:08:43]

vabr@chromium.org changed reviewers:
+ mkwst@chromium.org, msramek@chromium.org

[vabr (Chromium), 2015-03-27 16:08:44]

Mike, could you please review this quick fix?

Martin, if you see something wrong, please speak up.

Cheers,
Vaclav

[Mike West, 2015-03-27 16:10:03]

lgtm

[vabr (Chromium), 2015-03-27 16:14:15]

The CQ bit was checked by vabr@chromium.org

[msramek, 2015-03-27 16:14:24]

LGTM.

Unlike the others, that one checkbox has an OnClick() handler, sorry for the
confusion.

[commit-bot: I haz the power, 2015-03-27 16:14:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1043453002/1

[commit-bot: I haz the power, 2015-03-27 17:41:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 17:42:12]

Patchset 1 (id:??) landed as
https://crrev.com/e7da8d59282723d86026ab74ec244b599df5a12c
Cr-Commit-Position: refs/heads/master@{#322597}