Move ParseArguments to ParserBase and add tests.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 9467bb7f46b76ce26c2782b7ccec9b65d9083d4f..74fadbf1053ccb1fa62400b0adf7f874f2cf76ae 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -489,6 +489,9 @@ class ParserTraits {
   static Literal* EmptyLiteral() {
     return NULL;
   }
+  static ZoneList<Expression*>* NullExpressionList() {
+    return NULL;
+  }
 
   // Odd-ball literal creators.
   Literal* GetLiteralTheHole(int position,
@@ -692,7 +695,6 @@ class Parser : public ParserBase<ParserTraits> {
                                   Expression* subject,
                                   Statement* body);
 
-  ZoneList<Expression*>* ParseArguments(bool* ok);
   FunctionLiteral* ParseFunctionLiteral(
       Handle<String> name,
       Scanner::Location function_name_location,