Support type parameters and classes as expression in the vm.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 24832)
+++ runtime/vm/object.cc	(working copy)
@@ -1713,8 +1713,7 @@
 
 // Return a TypeParameter if the type_name is a type parameter of this class.
 // Return null otherwise.
-RawTypeParameter* Class::LookupTypeParameter(const String& type_name,
-                                             intptr_t token_pos) const {
+RawTypeParameter* Class::LookupTypeParameter(const String& type_name) const {
   ASSERT(!type_name.IsNull());
   Isolate* isolate = Isolate::Current();
   ReusableHandleScope reused_handles(isolate);