Revert of Ignore text elements for menu item related roles.

Revert of Ignore text elements for menu item related roles. (patchset #2 id:20001 of https://codereview.chromium.org/806823002/)

Reason for revert:
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/accessibility/aria-menuitemcheckbox.html
https://chromium.googlesource.com/chromium/src/+/master/content/test/data/accessibility/aria-menuitemradio.html

Original issue's description:
> 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

TBR=dmazzoni@chromium.org,k.czech@samsung.com
NOTREECHECKS=true
NOTRY=true
BUG=442278
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=187355

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

Created Revert of Ignore text elements for menu item related roles.

[commit-bot: I haz the power, 2014-12-17 10:10:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/796223003/1

[commit-bot: I haz the power, 2014-12-17 10:10:56]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=187355