Update a comment and fix a possible crash in HTMLSelectElement::setRecalcListItems.

Update a comment and fix a possible crash in HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.

BUG=625050
Committed: https://crrev.com/760c56deb503e184f25a77782e743b6d46732cb6
Cr-Commit-Position: refs/heads/master@{#403416}

[tkent, 2016-06-30 07:40:25]

Description was changed from

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.
==========

to

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.
==========

[tkent, 2016-06-30 07:48:38]

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

[tkent, 2016-06-30 07:48:39]

Keishi, would you review this please?

[keishi, 2016-07-01 01:12:46]

LGTM

[tkent, 2016-07-01 01:19:12]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-07-01 01:19:35]

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, 2016-07-01 03:17:59]

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

[commit-bot: I haz the power, 2016-07-01 03:18:00]

Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[tkent, 2016-07-01 05:21:30]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-07-01 05:21:43]

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

[tkent, 2016-07-01 06:19:14]

Description was changed from

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.
==========

to

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.

BUG=625050
==========

[commit-bot: I haz the power, 2016-07-01 06:28:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-01 06:29:02]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-01 06:30:30]

Description was changed from

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.

BUG=625050
==========

to

==========
Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems.

This is a follow-up of crrev.com/403093.

- Replace a TODO comment with an explanation, and add a test to reproduce the
  scenario.

- Fix a possible crash by m_listItems.remove(WTF::kNotFound) just in case.
  We don't find a reproduction.

BUG=625050

Committed: https://crrev.com/760c56deb503e184f25a77782e743b6d46732cb6
Cr-Commit-Position: refs/heads/master@{#403416}
==========

[commit-bot: I haz the power, 2016-07-01 06:30:31]

Patchset 1 (id:??) landed as
https://crrev.com/760c56deb503e184f25a77782e743b6d46732cb6
Cr-Commit-Position: refs/heads/master@{#403416}