Switch some objects in WmTest to use spyOn()

Helps reduce the complexity of test setup as spyOn()
allows spying on an object without creating a wrapper clone
of it

Bug: 113806960
Bug: 119830111
Test: Existing tests pass.
Change-Id: I6e7f8b6f728b5fffe90f34e42256fd0970037917
5 files changed