SharedWorker: Make sure route_id is always valid in WebSharedWorkerProxy

content/renderer/websharedworker_proxy.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_
 #define CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 10 matching lines @@
 namespace content {
 
 // Implementation of the WebSharedWorker APIs. This object is intended to only
 // live long enough to allow the caller to send a "connect" event to the worker
 // thread. Once the connect event has been sent, all future communication will
 // happen via the WebMessagePortChannel, and the WebSharedWorker instance will
 // be freed.
 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;
 
   // Implementations of WebSharedWorkerConnector APIs
   void connect(blink::WebMessagePortChannel* channel,
                ConnectListener* listener) override;
 
  private:
   // 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);
 
   // Sends any messages currently in the queue.
   void SendQueuedMessages();
 
   void OnWorkerCreated();
   void OnWorkerScriptLoadFailed();
   void OnWorkerConnected();
 
   // Routing id associated with this worker - used to receive messages from the
   // 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_;
 
   // Stores messages that were sent before the StartWorkerContext message.
   std::vector<std::unique_ptr<IPC::Message>> queued_messages_;
 
   ConnectListener* connect_listener_;
   bool created_;
 
   DISALLOW_COPY_AND_ASSIGN(WebSharedWorkerProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_WEBSHAREDWORKER_PROXY_H_