Revert 247926 "HID backend"

Breaks CrOS buildbots

http://build.chromium.org/p/chromium.chromiumos/buildstatus?builder=ChromiumOS%20%28daisy%29&number=16073
http://build.chromium.org/p/chromium.chromiumos/buildstatus?builder=ChromiumOS%20%28amd64%29&number=13917
http://build.chromium.org/p/chromium.memory/buildstatus?builder=Chromium%20OS%20%28x86%29%20ASAN&number=8064

> HID backend
> 
> BUG=290428
> 
> Review URL: https://codereview.chromium.org/143883005

TBR=ikarienator@chromium.org

Review URL: https://codereview.chromium.org/148183015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247934 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247934