wstrings: convert CppVariant and CppBoundClass to not use wstring

webkit/glue/cpp_bound_class.h

Index: webkit/glue/cpp_bound_class.h
diff --git a/webkit/glue/cpp_bound_class.h b/webkit/glue/cpp_bound_class.h
index a44638656adc76d2cce6155ef4d82c0e6bb37c7e..06662ce75f2adfa8fd2f1ff43bf134933a058156 100644
--- a/webkit/glue/cpp_bound_class.h
+++ b/webkit/glue/cpp_bound_class.h
@@ -65,8 +65,7 @@ class CppBoundClass {
   // as window.<classname>. The owner of the CppBoundObject is responsible for
   // keeping the object around while the frame is alive, and for destroying it
   // afterwards.
-  void BindToJavascript(
-      WebKit::WebFrame* frame, const std::wstring& classname);
+  void BindToJavascript(WebKit::WebFrame* frame, const std::string& classname);
 
   // The type of callbacks.
   typedef Callback2<const CppArgumentList&, CppVariant*>::Type Callback;