Merge "Update a comment and fix a possible crash in HTMLSelectElement::setRecalcListItems." to M53.

Merge "Update a comment and fix a possible crash in HTMLSelectElement::setRecalcListItems." to M53.

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, 625091
Review-Url: https://codereview.chromium.org/2103663006
Cr-Commit-Position: refs/heads/master@{#403416}
(cherry picked from commit 760c56deb503e184f25a77782e743b6d46732cb6)

Committed: https://chromium.googlesource.com/chromium/src/+/3fe2c3902b205e99caff0e774a1b4d19c019276d

[tkent, 2016-07-01 22:36:18]

Description was changed from

==========
Merge "Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems." to M53.

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=625050,625091

Review-Url: https://codereview.chromium.org/2103663006
Cr-Commit-Position: refs/heads/master@{#403416}
(cherry picked from commit 760c56deb503e184f25a77782e743b6d46732cb6)
==========

to

==========
Merge "Update a comment and fix a possible crash in
HTMLSelectElement::setRecalcListItems." to M53.

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=625050,625091

Review-Url: https://codereview.chromium.org/2103663006
Cr-Commit-Position: refs/heads/master@{#403416}
(cherry picked from commit 760c56deb503e184f25a77782e743b6d46732cb6)

Committed:
https://chromium.googlesource.com/chromium/src/+/3fe2c3902b205e99caff0e774a1b...
==========

[tkent, 2016-07-01 22:36:23]

Committed patchset #1 (id:1) manually as
3fe2c3902b205e99caff0e774a1b4d19c019276d.