SharedWorker: Make sure route_id is always valid in WebSharedWorkerProxy

content/renderer/websharedworker_proxy.h

Index: content/renderer/websharedworker_proxy.h
diff --git a/content/renderer/websharedworker_proxy.h b/content/renderer/websharedworker_proxy.h
index a1c74a3faf2ac3bb7cee0c2c7de67d4f30947749..9c854469bf3910ccd0888c7a06916e56e3bf6631 100644
--- a/content/renderer/websharedworker_proxy.h
+++ b/content/renderer/websharedworker_proxy.h
@@ -28,7 +28,6 @@ namespace content {
 class WebSharedWorkerProxy : public blink::WebSharedWorkerConnector,
                              private IPC::Listener {
  public:
-  // If the worker not loaded yet, route_id == MSG_ROUTING_NONE
   WebSharedWorkerProxy(IPC::MessageRouter* router, int route_id);
   ~WebSharedWorkerProxy() override;
 
@@ -40,9 +39,6 @@ class WebSharedWorkerProxy : public blink::WebSharedWorkerConnector,
   // IPC::Listener implementation.
   bool OnMessageReceived(const IPC::Message& message) override;
 
-  // Disconnects the worker (stops listening for incoming messages).
-  void Disconnect();
-
   // Sends a message to the worker thread (forwarded via the RenderViewHost).
   // If WorkerStarted() has not yet been called, message is queued.
   bool Send(std::unique_ptr<IPC::Message> message);
@@ -58,7 +54,7 @@ class WebSharedWorkerProxy : public blink::WebSharedWorkerConnector,
   // worker, and also to route messages to the worker (WorkerService contains
   // a map that maps between these renderer-side route IDs and worker-side
   // routing ids).
-  int route_id_;
+  const int route_id_;
 
   IPC::MessageRouter* const router_;