SELECT element: Fix a DCHECK failure in optionToBeShown().

SELECT element: Fix a DCHECK failure in optionToBeShown().

If a SELECT element had a selected OPTION, but restoreFormControlState()
could't find OPTIONs matched to FormControlState, m_lastOnChangeOption had a
stale value.

Use selectOption() in restoreFormControlState() to update m_lastOnChangeOption.

BUG=627833
Committed: https://crrev.com/5af661c7f9993c6fa9827dfddf738825a43264fe
Cr-Commit-Position: refs/heads/master@{#405447}

[tkent, 2016-07-14 05:01:29]

The CQ bit was checked by tkent@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-14 05:01:40]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[tkent, 2016-07-14 05:04:57]

The CQ bit was checked by tkent@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-07-14 05:05:11]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[tkent, 2016-07-14 05:13:53]

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

[tkent, 2016-07-14 05:13:53]

Hattori-san, would you review this please?

[keishi, 2016-07-14 05:38:21]

LGTM

[commit-bot: I haz the power, 2016-07-14 07:39:21]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-07-14 07:39:22]

Dry run: This issue passed the CQ dry run.

[tkent, 2016-07-14 07:39:53]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-07-14 07:40:05]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-14 07:44:17]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-14 07:44:19]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-14 07:46:06]

Description was changed from

==========
SELECT element: Fix a DCHECK failure in optionToBeShown().

If a SELECT element had a selected OPTION, but restoreFormControlState()
could't find OPTIONs matched to FormControlState, m_lastOnChangeOption had a
stale value.

Use selectOption() in restoreFormControlState() to update m_lastOnChangeOption.

BUG=627833
==========

to

==========
SELECT element: Fix a DCHECK failure in optionToBeShown().

If a SELECT element had a selected OPTION, but restoreFormControlState()
could't find OPTIONs matched to FormControlState, m_lastOnChangeOption had a
stale value.

Use selectOption() in restoreFormControlState() to update m_lastOnChangeOption.

BUG=627833

Committed: https://crrev.com/5af661c7f9993c6fa9827dfddf738825a43264fe
Cr-Commit-Position: refs/heads/master@{#405447}
==========

[commit-bot: I haz the power, 2016-07-14 07:46:07]

Patchset 2 (id:??) landed as
https://crrev.com/5af661c7f9993c6fa9827dfddf738825a43264fe
Cr-Commit-Position: refs/heads/master@{#405447}