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/array.cc b/runtime/mirror/array.cc
index f54af85..4535f6c 100644
--- a/runtime/mirror/array.cc
+++ b/runtime/mirror/array.cc
@@ -94,7 +94,7 @@
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
   mirror::Class* element_class_ptr = element_class.Get();
   StackHandleScope<1> hs(self);
-  Handle<mirror::Class> array_class(
+  MutableHandle<mirror::Class> array_class(
       hs.NewHandle(class_linker->FindArrayClass(self, &element_class_ptr)));
   if (UNLIKELY(array_class.Get() == nullptr)) {
     CHECK(self->IsExceptionPending());