Show form validation message as a fallback tooltip.

Show form validation message as a fallback tooltip.

If a form control has no |title| content attribute, show a validation message as a
tooltip.
The new behavior is compatible with Firefox.

BUG=550493
Committed: https://crrev.com/52dc0c9723271fa1949bd083b967ea91ddb32931
Cr-Commit-Position: refs/heads/master@{#359100}

[tkent, 2015-11-11 04:20:23]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org, kinuko@chromium.org

[tkent, 2015-11-11 04:20:23]

keishi@, please review the whole change.
kinuko@, please approve the content/test/ change.

[tkent, 2015-11-11 04:20:44]

Description was changed from

==========
Show form validation message as a fallback tooltip.

If a form control has no |title| content attribute, show a validation message as
a tooltip.

BUG=550493
==========

to

==========
Show form validation message as a fallback tooltip.

If a form control has no |title| content attribute, show a validation message as
a
tooltip.
The new behavior is compatible with Firefox.

BUG=550493
==========

[kinuko, 2015-11-11 08:14:17]

lgtm for content change.

[keishi, 2015-11-11 15:56:06]

LGTM

[tkent, 2015-11-11 16:07:26]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2015-11-11 16:07:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1435773002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1435773002/1

[commit-bot: I haz the power, 2015-11-11 16:40:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-12 19:57:57]

Patchset 1 (id:??) landed as
https://crrev.com/52dc0c9723271fa1949bd083b967ea91ddb32931
Cr-Commit-Position: refs/heads/master@{#359100}