Introduce extended mode.

src/ast-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 103 matching lines @@
 int FunctionLiteral::start_position() const {
   return scope()->start_position();
 }
 
 
 int FunctionLiteral::end_position() const {
   return scope()->end_position();
 }
 
 
-StrictModeFlag FunctionLiteral::strict_mode_flag() const {
-  return scope()->strict_mode_flag();
+LanguageMode FunctionLiteral::language_mode() const {
+  return scope()->language_mode();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_INL_H_