Keep the module in scope when executing scripts. This prevents a crash when the

ppapi/proxy/ppb_instance_proxy.cc

Index: ppapi/proxy/ppb_instance_proxy.cc
===================================================================
--- ppapi/proxy/ppb_instance_proxy.cc	(revision 81764)
+++ ppapi/proxy/ppb_instance_proxy.cc	(working copy)
@@ -120,6 +120,12 @@
 }
 
 bool PPB_Instance_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  // Prevent the dispatcher from going away during a call to ExecuteScript.
+  // This must happen OUTSIDE of ExecuteScript since the SerializedVars use
+  // the dispatcher upon return of the function (converting the
+  // SerializedVarReturnValue/OutParam to a SerializedVar in the destructor).
+  ScopedModuleReference death_grip(dispatcher());
+
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_Instance_Proxy, msg)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBInstance_GetWindowObject,