Revert of Add test for ChromeVox keyboard commands. (patchset #6 of https://codereview.chromium.org/490443002/)

Reason for revert:
Broke interactive_ui_tests on chromium.chromiumos waterfall: http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Tests%20%282%29/builds/1291

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

TBR=dtseng@chromium.org,sky@chromium.org,dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=404470

Review URL: https://codereview.chromium.org/500833002

Cr-Commit-Position: refs/heads/master@{#291576}
2 files changed