Merge "SELECT popup: Do not update popup content for arbitrary attribute change." to M52.

Merge "SELECT popup: Do not update popup content for arbitrary attribute change." to M52.

In the site of crbug.com/615250, mousedown event handler for a SELECT element sets
and deletes id attribute of the SELECT element. We shouldn't try to update popup
content in such case.

BUG=614250
Review-Url: https://codereview.chromium.org/2012653002
Cr-Commit-Position: refs/heads/master@{#395818}
(cherry picked from commit 194ad8e687efc243d3b836a648697aaab394fbf0)

Committed: https://chromium.googlesource.com/chromium/src/+/265054928b149e423dc8950e7222b642a092e0cb

[tkent, 2016-05-25 22:54:23]

Description was changed from

==========
Merge "SELECT popup: Do not update popup content for arbitrary attribute
change." to M52.

In the site of crbug.com/615250, mousedown event handler for a SELECT element
sets
and deletes id attribute of the SELECT element. We shouldn't try to update popup
content in such case.

BUG=614250

Review-Url: https://codereview.chromium.org/2012653002
Cr-Commit-Position: refs/heads/master@{#395818}
(cherry picked from commit 194ad8e687efc243d3b836a648697aaab394fbf0)
==========

to

==========
Merge "SELECT popup: Do not update popup content for arbitrary attribute
change." to M52.

In the site of crbug.com/615250, mousedown event handler for a SELECT element
sets
and deletes id attribute of the SELECT element. We shouldn't try to update popup
content in such case.

BUG=614250

Review-Url: https://codereview.chromium.org/2012653002
Cr-Commit-Position: refs/heads/master@{#395818}
(cherry picked from commit 194ad8e687efc243d3b836a648697aaab394fbf0)

Committed:
https://chromium.googlesource.com/chromium/src/+/265054928b149e423dc8950e7222...
==========

[tkent, 2016-05-25 22:54:26]

Committed patchset #1 (id:1) manually as
265054928b149e423dc8950e7222b642a092e0cb.