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This fixes the issue in two ways:
* At a high level, we no longer run a new find when nothing has changed.
* At a lower level, when both find_match and new_session are false, we
no longer end up in an infinite loop of calls to SendFindRequest.

Bug: 1129756
Change-Id: Ic2fdad11a83f882dff3dc272a5bd7da24cab8e3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418252
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809126}