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This is an attempt at fixing the flakiness of a number of autofill interactive
ui tests by changing the pattern from

  action();
  wait_for_result();

to

  setup_waiting();
  action();
  wait_for_result();

The former pattern might lose some events in case action() happens to complete
before wait_for_result() is called.

Bug: 967588
Change-Id: I66800ed03fd27d9e6cf4be6ee53cc0f29200f21d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757019Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688227}