[omnibox] Condition accessibility call

An added call is apparently triggering IME misbehavior. Condition the
call to only when it is needed.

Bug: 896962
Change-Id: I9bfb9aa702d5860f5274c78f9e8f0bb37109f685
Reviewed-on: https://chromium-review.googlesource.com/c/1413882
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623521}
1 file changed