shill: cellular: Removed unused variables from unittests.

CL:198322 removed some tests, rendering existing/new variables unused.
This broke the asan builder.
Remove dead code.

BUG=chromium:371066
TEST=FEATURES=test USE="clang asan" emerge-peppy platform2

Change-Id: I27c09ea916f207e33692e4c240a85603ece5fb1c
Reviewed-on: https://chromium-review.googlesource.com/198703
Reviewed-by: Thieu Le <thieule@chromium.org>
Commit-Queue: Peter Qiu <zqiu@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>