SELECT popup: Fix a crash by DOM mutation during opening popup.

SELECT popup: Fix a crash by DOM mutation during opening popup.

A mutation callback can be called after MutationObserver is disconnected
because MutationRecords are queued.

BUG=617578
Committed: https://crrev.com/6d47f4e6911287f41bbad2f1456b19bc59b8d6fe
Cr-Commit-Position: refs/heads/master@{#398244}

[tkent, 2016-06-07 03:54:31]

Description was changed from

==========
SELECT popup: Fix a crash by DOM mutation during opening popup.

BUG=617578
==========

to

==========
SELECT popup: Fix a crash by DOM mutation during opening popup.

A mutation callback can be called after MutationObserver is disconnected
because MutationRecords are queued.

BUG=617578
==========

[tkent, 2016-06-07 04:10:58]

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

[tkent, 2016-06-07 04:10:59]

Keishi, would you review this please?

[keishi, 2016-06-07 04:24:15]

LGTM

[tkent, 2016-06-07 05:37:31]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2016-06-07 05:37:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2040123002/1

[commit-bot: I haz the power, 2016-06-07 08:07:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-07 08:09:35]

Description was changed from

==========
SELECT popup: Fix a crash by DOM mutation during opening popup.

A mutation callback can be called after MutationObserver is disconnected
because MutationRecords are queued.

BUG=617578
==========

to

==========
SELECT popup: Fix a crash by DOM mutation during opening popup.

A mutation callback can be called after MutationObserver is disconnected
because MutationRecords are queued.

BUG=617578

Committed: https://crrev.com/6d47f4e6911287f41bbad2f1456b19bc59b8d6fe
Cr-Commit-Position: refs/heads/master@{#398244}
==========

[commit-bot: I haz the power, 2016-06-07 08:09:36]

Patchset 1 (id:??) landed as
https://crrev.com/6d47f4e6911287f41bbad2f1456b19bc59b8d6fe
Cr-Commit-Position: refs/heads/master@{#398244}