Avoid UAF in PepperUDP/TCPSocketMessageFilter

content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc

Index: content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc
diff --git a/content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc b/content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc
index 36482d098f51d08135c074d68b6bab5d31ae3382..547483121a5943f38aa5fd10661958804ab08f12 100644
--- a/content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc
+++ b/content/browser/renderer_host/pepper/pepper_udp_socket_message_filter.cc
@@ -76,7 +76,9 @@ PepperUDPSocketMessageFilter::PepperUDPSocketMessageFilter(
       external_plugin_(host->external_plugin()),
       private_api_(private_api),
       render_process_id_(0),
-      render_frame_id_(0) {
+      render_frame_id_(0),
+      is_potentially_secure_plugin_context_(
+          host->IsPotentiallySecurePluginContext(instance)) {
   ++g_num_instances;
   DCHECK(host);
 
@@ -690,9 +692,8 @@ void PepperUDPSocketMessageFilter::SendBindReply(
     const ppapi::host::ReplyMessageContext& context,
     int32_t result,
     const PP_NetAddress_Private& addr) {
-  UMA_HISTOGRAM_BOOLEAN(
-      "Pepper.PluginContextSecurity.UDPBind",
-      host_->IsPotentiallySecurePluginContext(resource_host()->pp_instance()));
+  UMA_HISTOGRAM_BOOLEAN("Pepper.PluginContextSecurity.UDPBind",
+                        is_potentially_secure_plugin_context_);
 
   ppapi::host::ReplyMessageContext reply_context(context);
   reply_context.params.set_result(result);