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This updates test classes and unit tests to avoid using ssid as a key
to uniquely identify networks.

Bug: 966270
Change-Id: Ic1ff783e8685b908cb54555b98356314fdba0d12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838307Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jon Mann <jonmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703546}