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Previously, when a scan began, we would clear all existing scan results
from the cache, then add results back to the cache as the scan
progressed. This was janky because it would result in the UI removing
Tether networks and then adding them back shortly afterwards when scan
results came in.

This CL changes this functionality so that results are only removed
after a scan ends and the associated device is not found.

Bug: 672263, 746726
Change-Id: I6df2516b1bc0e604c3a496838804bc6ee5c8292c
Reviewed-on: https://chromium-review.googlesource.com/581633
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488817}