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Such that the tests no longer depend on BleConnectionManager.

* Remove as much simulation using dependent objects as possible.
* Directly call methods under test.
* Remove irrelevant tests.

R=khorimoto@chromium.org

Bug: none
Test: ConnectTetheringOperationTest.*
Change-Id: I7f6c69e90dfe2f4d3006067de92db0973486c4d4
Reviewed-on: https://chromium-review.googlesource.com/c/1351478
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612368}