[Extensions UI Views] Adjust the wrench menu actions for items added/removed

[Extensions UI Views] Adjust the wrench menu actions for items added/removed

Extension items can be added or removed to the wrench menu while it is open
(if, for instance, a popup closes and slides the item back in, or, more rarely,
the extension is only just added, crashes, etc). In rare cases, this can result
in the container needing to add or remove a row, which means the rest of the
menu's height needs to adjust.

BUG=591028
Review URL: https://codereview.chromium.org/1757993003

Cr-Commit-Position: refs/heads/master@{#379035}
(cherry picked from commit f3f1fd9a78e963f3068d7eb46a66e4ff40348f4b)

Committed: https://chromium.googlesource.com/chromium/src/+/94da142c673729d277c271134754d82677eefa93

[Devlin, 2016-03-04 20:11:44]

Description was changed from

==========
[Extensions UI Views] Adjust the wrench menu actions for items added/removed

Extension items can be added or removed to the wrench menu while it is open
(if, for instance, a popup closes and slides the item back in, or, more rarely,
the extension is only just added, crashes, etc). In rare cases, this can result
in the container needing to add or remove a row, which means the rest of the
menu's height needs to adjust.

BUG=591028

Review URL: https://codereview.chromium.org/1757993003

Cr-Commit-Position: refs/heads/master@{#379035}
(cherry picked from commit f3f1fd9a78e963f3068d7eb46a66e4ff40348f4b)
==========

to

==========
[Extensions UI Views] Adjust the wrench menu actions for items added/removed

Extension items can be added or removed to the wrench menu while it is open
(if, for instance, a popup closes and slides the item back in, or, more rarely,
the extension is only just added, crashes, etc). In rare cases, this can result
in the container needing to add or remove a row, which means the rest of the
menu's height needs to adjust.

BUG=591028

Review URL: https://codereview.chromium.org/1757993003

Cr-Commit-Position: refs/heads/master@{#379035}
(cherry picked from commit f3f1fd9a78e963f3068d7eb46a66e4ff40348f4b)

Committed:
https://chromium.googlesource.com/chromium/src/+/94da142c673729d277c271134754...
==========

[Devlin, 2016-03-04 20:11:45]

Committed patchset #1 (id:1) manually as
94da142c673729d277c271134754d82677eefa93.