Bug 747055 - Crash in RtlEnterCriticalSection | PR_Lock | mozilla::ipc::RPCChannel::WaitForNotify. r=bsmedberg

dom/plugins/ipc/PluginModuleParent.cpp

@@ -178,7 +178,7 @@ PluginModuleParent::TimeoutChanged(const char* aPref, void* aModule)
 void
 PluginModuleParent::CleanupFromTimeout()
 {
-    if (!mShutdown)
+    if (!mShutdown && OkToCleanup())
         Close();
 }