Revert of [es6] Super call in arrows and eval

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index 63cd13d47c175ce5b934825df1d2ccb4163ea0ea..d56018532152909538635d95cdb50286ddfc0d34 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -417,13 +417,6 @@
                                     IsAccessorFunction(function_kind()) ||
                                     IsConstructor(function_kind()))));
     return home_object_;
-  }
-
-  Variable* this_function_var() const {
-    // This is only used in derived constructors atm.
-    DCHECK(this_function_ == nullptr ||
-           (is_function_scope() && IsSubclassConstructor(function_kind())));
-    return this_function_;
   }
 
   // Declarations list.
@@ -586,8 +579,6 @@
   Variable* arguments_;
   // Convenience variable; method scopes only.
   Variable* home_object_;
-  // Convenience variable; Subclass constructor only
-  Variable* this_function_;
   // Module descriptor; module scopes only.
   ModuleDescriptor* module_descriptor_;