ObjPtr<>-ify ClassLinker::FindClass(), fix 1 stale reference use.

Thread::CreateAnnotatedStackTrace() was using a stale
reference `aste_array_class`.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 31113334
Change-Id: I191907c0053456bb57de425aa6ccd9668df818a2
diff --git a/runtime/hidden_api_test.cc b/runtime/hidden_api_test.cc
index ab0c290..a41d284 100644
--- a/runtime/hidden_api_test.cc
+++ b/runtime/hidden_api_test.cc
@@ -325,8 +325,8 @@
   ASSERT_TRUE(h_iface != nullptr);
 
   // Create the proxy class.
-  std::vector<mirror::Class*> interfaces;
-  interfaces.push_back(h_iface.Get());
+  std::vector<Handle<mirror::Class>> interfaces;
+  interfaces.push_back(h_iface);
   Handle<mirror::Class> proxyClass = hs.NewHandle(proxy_test::GenerateProxyClass(
       soa, jclass_loader_, runtime_->GetClassLinker(), "$Proxy1234", interfaces));
   ASSERT_TRUE(proxyClass != nullptr);