Fixed crashed when activating the context menu for toolbar buttons using Voiceover

Fixed crashed when activating the context menu for toolbar buttons that are found in the browser's UI, e.g. Reload button.

TESTED=Manual testing
BUG=515909
R=dmazzoni@chromium.org, avi@chromium.org

Committed: https://crrev.com/2cea93b6c01a158d390f8a93a28656c8c6ee0d2e
Cr-Commit-Position: refs/heads/master@{#341800}

[dmazzoni, 2015-07-31 22:26:03]

Looks fine, but avi or some other owner needs to review, not me.

[nektarios, 2015-08-01 02:19:45]

nektar@chromium.org changed reviewers:
+ avi@chromium.org

[nektarios, 2015-08-01 02:20:00]

+Avi

[Avi (use Gerrit), 2015-08-01 03:58:51]

LGTM with small formatting nit fixed.

https://codereview.chromium.org/1256183004/diff/140001/chrome/browser/ui/coco...
File chrome/browser/ui/cocoa/clickhold_button_cell_unittest.mm (right):

https://codereview.chromium.org/1256183004/diff/140001/chrome/browser/ui/coco...
chrome/browser/ui/cocoa/clickhold_button_cell_unittest.mm:125: [cell
setEnableRightClick:YES];
indent 2

[nektarios, 2015-08-04 20:24:09]

The CQ bit was checked by nektar@chromium.org

[nektarios, 2015-08-04 20:24:09]

The patchset sent to the CQ was uploaded after l-g-t-m from avi@chromium.org
Link to the patchset: https://codereview.chromium.org/1256183004/#ps160001
(title: "Fixed indentation.")

[nektarios, 2015-08-04 20:24:55]

Indentation fixed.

[commit-bot: I haz the power, 2015-08-04 20:25:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1256183004/160001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1256183004/160001

[commit-bot: I haz the power, 2015-08-04 21:29:16]

Committed patchset #9 (id:160001)

[commit-bot: I haz the power, 2015-08-04 21:31:25]

Patchset 9 (id:??) landed as
https://crrev.com/2cea93b6c01a158d390f8a93a28656c8c6ee0d2e
Cr-Commit-Position: refs/heads/master@{#341800}