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- Calls stopAutocomplete(/*clearResult=*/ true) when results are cleared so
  that the state of results in JS matches that of the Autocomplete backend.
- Queries the autocomplete on pressing the arrow up/down keys when the
  matches are hidden rather than simply showing the old matches because
  there are now no autocomplete results to back them.

Bug: 1021312
Change-Id: I8aa24f9c40a5076f55c40846ba43298a3b144a8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900652Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713326}