Revert of Add test for ChromeVox keyboard commands.

Revert of Add test for ChromeVox keyboard commands. (patchset #7 id:120001 of https://codereview.chromium.org/490443002/)

Reason for revert:
Broke interactive_ui_tests on Linux ChromiumOS Ozone: http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Tests%20%282%29/builds/1626/steps/interactive_ui_tests

Failing tests:
ChromeVoxNavigateAndSelect_0
ChromeVoxPrefixKey_0
ChromeVoxPrefixKey_1
ChromeVoxShiftSearch_0
ChromeVoxShiftSearch_1


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

TBR=dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404470
Committed: https://crrev.com/14b630c415923f86f1cdf44f600aa4539a7d4737
Cr-Commit-Position: refs/heads/master@{#293251}

[Vadim Sh., 2014-09-04 02:00:09]

Created Revert of Add test for ChromeVox keyboard commands.

[commit-bot: I haz the power, 2014-09-04 02:02:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vadimsh@chromium.org/535283004/1

[commit-bot: I haz the power, 2014-09-04 02:04:22]

Committed patchset #1 (id:1) as 7abcef110322f09ab569000497df3d61c47e1607

[commit-bot: I haz the power, 2014-09-10 03:29:31]

Patchset 1 (id:??) landed as
https://crrev.com/14b630c415923f86f1cdf44f600aa4539a7d4737
Cr-Commit-Position: refs/heads/master@{#293251}