Eliminate extended mode, and other modes clean-up

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index 00ae587d640aadcaac3e9cb5cf8be0b93dfef162..0e8b7352d3b62399674b3ae8abea6ac0af56cf8a 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -376,7 +376,7 @@ class Factory {
 
   Handle<JSFunction> NewFunctionWithoutPrototype(
       Handle<String> name,
-      LanguageMode language_mode);
+      StrictMode strict_mode);
 
   Handle<JSFunction> NewFunction(Handle<Object> super, bool is_global);
 
@@ -578,7 +578,7 @@ class Factory {
 
   Handle<JSFunction> NewFunctionWithoutPrototypeHelper(
       Handle<String> name,
-      LanguageMode language_mode);
+      StrictMode strict_mode);
 
   // Create a new map cache.
   Handle<MapCache> NewMapCache(int at_least_space_for);