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Prior to this CL, a scan for instant tethering networks is performed
every time the PHoneHub UI bubble opens. Now, a scan for tether
networks only occurs the first time the user opens PhoneHub when its
enabled during their session.

Fixed: 1164517
Bug: 1106937
Change-Id: I281fb88bafdc375391e0596052b327657ee71c47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621982
Commit-Queue: Regan Hsu <hsuregan@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843092}