ART: Rename Handle hierarchy

Bring the names in line with normal OO principles: ConstHandle
becomes Handle, and Handle becomes MutableHandle.

Change-Id: I0f018eb7ba28bc422e3a23dd73a6cbe6fc2d2044
diff --git a/runtime/mirror/class.cc b/runtime/mirror/class.cc
index e7d8163..0ee8fa8 100644
--- a/runtime/mirror/class.cc
+++ b/runtime/mirror/class.cc
@@ -760,7 +760,7 @@
   return GetInterfaceTypeList()->GetTypeItem(idx).type_idx_;
 }
 
-mirror::Class* Class::GetDirectInterface(Thread* self, ConstHandle<mirror::Class> klass,
+mirror::Class* Class::GetDirectInterface(Thread* self, Handle<mirror::Class> klass,
                                          uint32_t idx) {
   DCHECK(klass.Get() != nullptr);
   DCHECK(!klass->IsPrimitive());