Change scanner buffers to not use utf-8.

src/factory.h

Index: src/factory.h
diff --git a/src/factory.h b/src/factory.h
index b7a2882e8358e5304e5e05c8f499307a21b54176..a5e159123847f077d05e37317f98903810ba81a5 100644
--- a/src/factory.h
+++ b/src/factory.h
@@ -61,6 +61,8 @@ class Factory : public AllStatic {
       PretenureFlag pretenure);
 
   static Handle<String> LookupSymbol(Vector<const char> str);
+  static Handle<String> LookupAsciiSymbol(Vector<const char> str);
+  static Handle<String> LookupTwoByteSymbol(Vector<const uc16> str);
   static Handle<String> LookupAsciiSymbol(const char* str) {
     return LookupSymbol(CStrVector(str));
   }