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- Realbox input always gets focus after deleting a match.
- Selects the first match in the list after deletion and fills the realbox
  input with its content if it is allowed to be the default match.
  Otherwise sets the input to the user typed value.

Bug: 1018437
Change-Id: I02fd690a0c0acaa570f37604970c13391af14b63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881991
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710634}