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This removes the implementation of the mojom::AXHost interface and the
interface itself.

TBR=rmrossi@chromium.org

Bug: 958187
Change-Id: I68f9eec4e7004a623579f90bf22bdc7e7e9473f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592847Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: David Tseng <dtseng@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656386}