Pepper: always delete ResourceMessageFilter objects on the creation thread.

chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc

Index: chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc
diff --git a/chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc b/chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc
index 60ffa5c850412634cf1566b9e0de9823299e1875..eb8a2be3554e805e91f806de173f7ee2e9d44ba9 100644
--- a/chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc
+++ b/chrome/browser/renderer_host/pepper/pepper_broker_message_filter.cc
@@ -27,7 +27,8 @@ namespace chrome {
 PepperBrokerMessageFilter::PepperBrokerMessageFilter(
     PP_Instance instance,
     BrowserPpapiHost* host)
-    : document_url_(host->GetDocumentURLForInstance(instance)) {
+    : ResourceMessageFilter(DELETE_ON_ANY_THREAD),
+      document_url_(host->GetDocumentURLForInstance(instance)) {
   int unused;
   host->GetRenderViewIDsForInstance(instance, &render_process_id_, &unused);
 }