Modify chooser controller to correctly handle removing item on Mac

Modify chooser controller to correctly handle removing item on Mac

This CL modified ChooserBubbleUiController and ChooserDialogCocoaController
to correctly handle removing item. And it also added and updated test code
to cover it.

BUG=619230
Committed: https://crrev.com/d5ca45e05f2000f644a0b092813d294bcdcc5cc4
Cr-Commit-Position: refs/heads/master@{#399494}

[juncai, 2016-06-10 23:59:19]

juncai@chromium.org changed reviewers:
+ rsesek@chromium.org

[juncai, 2016-06-10 23:59:19]

Please take a look.

[Robert Sesek, 2016-06-13 17:22:42]

lgtm

[juncai, 2016-06-13 17:26:28]

The CQ bit was checked by juncai@chromium.org

[commit-bot: I haz the power, 2016-06-13 17:27:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2054333002/1

[commit-bot: I haz the power, 2016-06-13 18:48:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-13 18:49:11]

CQ bit was unchecked

[commit-bot: I haz the power, 2016-06-13 18:51:12]

Description was changed from

==========
Modify chooser controller to correctly handle removing item on Mac

This CL modified ChooserBubbleUiController and ChooserDialogCocoaController
to correctly handle removing item. And it also added and updated test code
to cover it.

BUG=619230
==========

to

==========
Modify chooser controller to correctly handle removing item on Mac

This CL modified ChooserBubbleUiController and ChooserDialogCocoaController
to correctly handle removing item. And it also added and updated test code
to cover it.

BUG=619230

Committed: https://crrev.com/d5ca45e05f2000f644a0b092813d294bcdcc5cc4
Cr-Commit-Position: refs/heads/master@{#399494}
==========

[commit-bot: I haz the power, 2016-06-13 18:51:13]

Patchset 1 (id:??) landed as
https://crrev.com/d5ca45e05f2000f644a0b092813d294bcdcc5cc4
Cr-Commit-Position: refs/heads/master@{#399494}