[ast][parser] Remove redundant Declaration::mode_.

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 8f7bf0884ba5a91fbbb8d749201fe3c6c49db3ce..1648700d2aaa931a3b4f6e00c44dc8bf63db3e09 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -1089,7 +1089,7 @@ class Parser : public ParserBase<ParserTraits> {
   VariableProxy* NewUnresolved(const AstRawString* name, VariableMode mode);
   Variable* Declare(Declaration* declaration,
                     DeclarationDescriptor::Kind declaration_kind,
-                    InitializationFlag init, bool* ok,
+                    VariableMode mode, InitializationFlag init, bool* ok,
                     Scope* declaration_scope = nullptr);
   Declaration* DeclareVariable(const AstRawString* name, VariableMode mode,
                                int pos, bool* ok);