[Password Generation] Send onchange event when password is filled

[Password Generation] Send onchange event when password is filled

Failure to do so causes UI issues on some sites, and causes form submission
to fail on Yahoo.

BUG=159043
Committed: https://crrev.com/dfef9806fea030778404f9bea5d78ed313c31816
Cr-Commit-Position: refs/heads/master@{#302510}

[Garrett Casto, 2014-11-03 08:11:14]

gcasto@chromium.org changed reviewers:
+ vabr@chromium.org

[vabr (Chromium), 2014-11-03 08:51:43]

LGTM

[Garrett Casto, 2014-11-03 21:56:34]

The CQ bit was checked by gcasto@chromium.org

[commit-bot: I haz the power, 2014-11-03 21:58:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/680413004/1

[commit-bot: I haz the power, 2014-11-03 23:06:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-03 23:06:58]

Patchset 1 (id:??) landed as
https://crrev.com/dfef9806fea030778404f9bea5d78ed313c31816
Cr-Commit-Position: refs/heads/master@{#302510}