Pepper: Add a X-Requested-With header to URL requests done for Pepper plugins.

webkit/plugins/ppapi/ppb_url_loader_impl.cc

Index: webkit/plugins/ppapi/ppb_url_loader_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_url_loader_impl.cc b/webkit/plugins/ppapi/ppb_url_loader_impl.cc
index e707f261a20293f5e5424157f6b6a69c4573de4a..3decd531e38795d7cd2da7b94b916fd89c2cdc08 100644
--- a/webkit/plugins/ppapi/ppb_url_loader_impl.cc
+++ b/webkit/plugins/ppapi/ppb_url_loader_impl.cc
@@ -149,7 +149,8 @@ int32_t PPB_URLLoader_Impl::Open(
   if (!frame)
     return PP_ERROR_FAILED;
   WebURLRequest web_request;
-  if (!CreateWebURLRequest(&filled_in_request_data, frame, &web_request))
+  if (!CreateWebURLRequest(pp_instance(), &filled_in_request_data, frame,
+                           &web_request))
     return PP_ERROR_FAILED;
   web_request.setRequestorProcessID(requestor_pid);