[strong] Remove all remainders of strong mode

src/transitions-inl.h

Index: src/transitions-inl.h
diff --git a/src/transitions-inl.h b/src/transitions-inl.h
index 9424497e199ac2941e7eac15ff362701ed55933b..ea02d61031deb9a709a42e394c8a6c9c754c51f6 100644
--- a/src/transitions-inl.h
+++ b/src/transitions-inl.h
@@ -114,7 +114,6 @@ bool TransitionArray::IsSpecialTransition(Name* name) {
          name == heap->sealed_symbol() || name == heap->frozen_symbol() ||
          name == heap->elements_transition_symbol() ||
          name == heap->strict_function_transition_symbol() ||
-         name == heap->strong_function_transition_symbol() ||
          name == heap->observed_symbol();
 }
 #endif