Revert "Create parent class loader for dex2oat"

Bug: 22858531

This reverts commit d37d364c27e74a7b49970a8c970482e273aa7b1a.

Change-Id: Id71a6f3bb9a29c04a5c13210633674e05d798114
diff --git a/runtime/common_runtime_test.cc b/runtime/common_runtime_test.cc
index a4e16ae..2184f0a 100644
--- a/runtime/common_runtime_test.cc
+++ b/runtime/common_runtime_test.cc
@@ -591,8 +591,7 @@
 
   Thread* self = Thread::Current();
   jobject class_loader = Runtime::Current()->GetClassLinker()->CreatePathClassLoader(self,
-                                                                                     class_path,
-                                                                                     nullptr);
+                                                                                     class_path);
   self->SetClassLoaderOverride(class_loader);
   return class_loader;
 }