Revert of Add test for ChromeVox keyboard commands.

Revert of Add test for ChromeVox keyboard commands. (patchset #8 id:140001 of https://codereview.chromium.org/490443002/)

Reason for revert:
Broke Linux ChromiumOS Tests (dbg)(3)

http://build.chromium.org/p/chromium.webkit/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%283%29/builds/1199

Original issue's description:
> Add test for ChromeVox keyboard commands.
> 
> This is just a couple of quick sanity checks to prevent future regressions
> like the one in the linked bug. It tests both a Search+Shift shortcut and
> the corresponding Prefix Key shortcut.
> 
> Adds support for sending the meta modifier key in
> aura/x11 tests.
> 
> BUG=404470
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291547
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/8cab2737f1cb6e6011b0946f6bef5027868602c0
> 
> Committed: https://chromium.googlesource.com/chromium/src/+/ad123c3ac76fadc625a9dff66960743d0df253ba

TBR=dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404470
Committed: https://crrev.com/b2a7771b89853f75969d43c108de588213b79714
Cr-Commit-Position: refs/heads/master@{#293718}

[arv (Not doing code reviews), 2014-09-08 14:15:30]

Created Revert of Add test for ChromeVox keyboard commands.

[commit-bot: I haz the power, 2014-09-08 14:16:59]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/arv@chromium.org/550183002/1

[commit-bot: I haz the power, 2014-09-08 14:21:25]

Committed patchset #1 (id:1) as e9bea29fdb24105d97a537c18792b44ab2426ecd

[commit-bot: I haz the power, 2014-09-10 03:46:03]

Patchset 1 (id:??) landed as
https://crrev.com/b2a7771b89853f75969d43c108de588213b79714
Cr-Commit-Position: refs/heads/master@{#293718}