Revert of Support Compat mode inside of the desktop tree.

Revert of Support Compat mode inside of the desktop tree. (patchset #12 id:220001 of https://codereview.chromium.org/1191783002/)

Reason for revert:
Crashes tests on Linux ChromiumOS Tests (1): TestAsNormalAndGuestUser_SpokenFeedbackTest.NavigateSystemTray_0
TestAsNormalAndGuestUser_SpokenFeedbackTest.NavigateSystemTray_1

https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%281%29/builds/5005

Original issue's description:
> Support Compat mode inside of the desktop tree.
> 
> Depends on
> https://codereview.chromium.org/1185753008/
> 
> Removes native bindings for Search+Shift+Arrows in favor of the extension commands bindings. Enables all ChromeVox Compat/Next commands inside of the desktop tree. Adds a test to exercise next element and next button commands.
> 
> Also, whitelists root nodes without urls for ChromeVox compat. This includes the shelf/launcher.
> 
> TEST=SpokenFeedbackTest.*
> 
> Committed: https://crrev.com/e7b1c72c03dcf636e50917b2c8122e5d0ef884b6
> Cr-Commit-Position: refs/heads/master@{#336181}

TBR=dmazzoni@chromium.org,oshima@chromium.org,dtseng@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[Mike Wittman, 2015-06-25 18:06:05]

Created Revert of Support Compat mode inside of the desktop tree.

[commit-bot: I haz the power, 2015-06-25 18:09:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1211023002/1

[commit-bot: I haz the power, 2015-06-25 18:13:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-25 18:13:31]

Failed to apply the patch.

[Mike Wittman, 2015-06-25 18:17:39]

Closing; already reverted by author.