This class is no longer necessary or used.

BUG=angleproject:963

Change-Id: I5e6fa64822e637e1cc769be6fe777fa6e13a0d83
Reviewed-on: https://chromium-review.googlesource.com/263484Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>