Fix crash in web workers when entangled port sender is null.

chrome/browser/worker_host/message_port_dispatcher.cc

Index: chrome/browser/worker_host/message_port_dispatcher.cc
===================================================================
--- chrome/browser/worker_host/message_port_dispatcher.cc	(revision 66481)
+++ chrome/browser/worker_host/message_port_dispatcher.cc	(working copy)
@@ -199,7 +199,9 @@
     IPC::Message* ipc_msg = new WorkerProcessMsg_Message(
         entangled_port.route_id, message, sent_message_port_ids,
         new_routing_ids);
-    entangled_port.sender->Send(ipc_msg);
+

[levin, 2010/11/18 05:06:40]

John is the right person to review this and can hopefully check the code for
places with similar problems.

fwiw, this change has a memory leak.

A simple fix is to move this allocation inside of " if (entangled_port.sender)"
with entangled_port.sender->Send(ipc_msg);

[inferno, 2010/11/18 06:12:52]

Done.

+    if (entangled_port.sender)
+      entangled_port.sender->Send(ipc_msg);
   }
 }