Remove unused string from ast-value-factory.

src/ast/ast-value-factory.h

Index: src/ast/ast-value-factory.h
diff --git a/src/ast/ast-value-factory.h b/src/ast/ast-value-factory.h
index e3d2cc63775c039a63877889237a40e932e9c797..63a0c34649e64827d71ad1205893ac5efd1bc005 100644
--- a/src/ast/ast-value-factory.h
+++ b/src/ast/ast-value-factory.h
@@ -286,7 +286,6 @@ class AstValue : public ZoneObject {
   F(dot_class_field_init, ".class-field-init")  \
   F(dot_debug_is_active, ".debug_is_active")    \
   F(dot_for, ".for")                            \
-  F(dot_generator, ".generator")                \
   F(dot_generator_object, ".generator_object")  \
   F(dot_iterator, ".iterator")                  \
   F(dot_promise, ".promise")                    \