Trying to remove waiting for broadcasts

Way back we suspected that this would prevent Launcher restarts while the test runs, but later we seem to have found another solution.

Now the tests can sit for, like, 90 sec in this call.

So let's remove it and see what happens.

Test: presubmit
Bug: 187761685
Change-Id: I4baa174b48151151d657e833f121b2e6daa27453