Delete some unused code found by -Wunused-function

ppapi/proxy/ppb_file_ref_proxy.cc

Index: ppapi/proxy/ppb_file_ref_proxy.cc
diff --git a/ppapi/proxy/ppb_file_ref_proxy.cc b/ppapi/proxy/ppb_file_ref_proxy.cc
index 3889c77b9295f20740dff31895c37df12cda3f3c..dcfb137b077f469aafbab6d995db053bfc94bb05 100644
--- a/ppapi/proxy/ppb_file_ref_proxy.cc
+++ b/ppapi/proxy/ppb_file_ref_proxy.cc
@@ -165,14 +165,6 @@ int FileRef::SendCallback(scoped_refptr<TrackedCallback> callback) {
   return next_callback_id_++;
 }
 
-namespace {
-
-InterfaceProxy* CreateFileRefProxy(Dispatcher* dispatcher) {
-  return new PPB_FileRef_Proxy(dispatcher);
-}
-
-}  // namespace
-
 PPB_FileRef_Proxy::PPB_FileRef_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
       callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {