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Just a helper to check if both suffix and prefix autocompletion are
empty. This is in preparation for the potential introduction of a 3rd
autocompletion field.

Bug: 1062446
Change-Id: I58aecb9cffb690618bb835ed97e1cb69cfdae635
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426964
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810248}