(This change is merged from http://go/wvgerrit/124824)
GenerateSimpleSampleDescription() only had asserts to check parameters
that only came from other test code, so they weren't testing anything of
use. With the asserts removed, it's no longer necessary to wrap calls to
GenerateSimpleSampleDescription() with ASSERT_NO_FATAL_FAILURE(), which
a lot of callers were already forgetting to do anyway. This also
simplifies a future patch that will generalize the decryption test code
to work with entitlement licenses.
Bug: 186782279
Test: x86-64 platform
Test: build_and_run_all_unit_tests
Change-Id: I987427fdfee4826d77ab95344f9aca8c374b2001