Declare 'this' as DYNAMIC_GLOBAL on the script_scope

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index 6932e84babfe7f7e3c350f710cea82018325f044..0e1d21431d741f391712898ac106a197df43244b 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -522,8 +522,7 @@ class Scope: public ZoneObject {
 
   // Create a non-local variable with a given name.
   // These variables are looked up dynamically at runtime.
-  Variable* NonLocal(const AstRawString* name, VariableMode mode,
-                     Variable::Kind variable_kind);
+  Variable* NonLocal(const AstRawString* name, VariableMode mode);
 
   // Variable resolution.
   // Possible results of a recursive variable lookup telling if and how a