Remove AXObjectCacheImpl::AccessibilityEnabled, which has no definition.

Definition was removed in:
  https://chromium-review.googlesource.com/c/chromium/src/+/1150824/

Change-Id: I1c1b19bdfa92bcdb80694728880a5cc4ab58df20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618204
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671585}
1 file changed