Ignore text elements for menu item related roles.

Ignore text elements for menu item related roles.

Text elements should go along with menu item related roles.
Let's consider this example: <div role="menuitemcheckbox" tabindex="0">menu item checkbox</div>
Currently MenuItemCheckBoxRole is represented by accessible object and its title is the second
accessible object. Expected behavior is that we should have just one accessible object.

BUG=442278
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=187323

[k.czech, 2014-12-16 19:19:23]

k.czech@samsung.com changed reviewers:
+ dmazzoni@chromium.org

[dmazzoni, 2014-12-17 01:03:11]

The CQ bit was checked by dmazzoni@chromium.org

[dmazzoni, 2014-12-17 01:03:11]

lgtm

[commit-bot: I haz the power, 2014-12-17 01:03:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/806823002/20001

[commit-bot: I haz the power, 2014-12-17 02:20:47]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=187323

[alancutter (OOO until 2018), 2014-12-17 10:09:43]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/796223003/ by alancutter@chromium.org.

The reason for reverting is: Broke the Win 7 Tests builder:
http://build.chromium.org/p/chromium.webkit/builders/Win7%20Tests

Example build failure:
http://build.chromium.org/p/chromium.webkit/builders/Win7%20Tests/builds/7521

Two content_browser tests tests failing:
https://chromium.googlesource.com/chromium/src/+/master/content/test/data/acc...
https://chromium.googlesource.com/chromium/src/+/master/content/test/data/acc....