Don't handle DispatchOnInspectorBackend msg for SharedWorkers in DevToolsAgentFilter.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 88e0c3db1bce585d0df2511296849bf3e8a1b61e..7f0f85b8e32c14d9ec5df43e3e5a8ba4da56ce43 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -374,6 +374,9 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   void WidgetHidden();
   void WidgetRestored();
 
+  void AddSharedWorkerRoute(int32 routing_id, IPC::Listener* listener);
+  void RemoveSharedWorkerRoute(int32 routing_id);
+
  private:
   // ChildThread
   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;