ObjPtr<>-ify tests using ClassLinker::FindClass()

ClassLinker::FindClass() returns a non-ObjPtr<> reference
but it has a lot of uses, so we shall change the uses in
a few steps. This change deals with several tests.

Test: Rely on TreeHugger.
Bug: 31113334
Change-Id: Ib75e20e7ebaff01fb607a09f96675f8cf397ae52
Signed-off-by: mydongistiny <jaysonedson@gmail.com>
13 files changed