Fix unitialized memory access in workers.

chrome/browser/worker_host/message_port_dispatcher.h

 // Copyright (c) 2009 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 CHROME_BROWSER_WORKER_HOST_MESSAGE_PORT_DISPATCHER_H_
 #define CHROME_BROWSER_WORKER_HOST_MESSAGE_PORT_DISPATCHER_H_
 
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 49 matching lines @@
 
   void PostMessageTo(int message_port_id,
                      const string16& message,
                      const std::vector<int>& sent_message_port_ids);
 
   // NotificationObserver interface.
   void Observe(NotificationType type,
                const NotificationSource& source,
                const NotificationDetails& details);
 
+  // Handles the details of removing a message port id. Before calling this,
+  // verify that the message port id exists.
+  void Erase(int message_port_id);
+
+#ifdef NDEBUG
+  bool CheckMessagePortMap(bool check_entanglements) { }
+#else
+  bool CheckMessagePortMap(bool check_entanglements);
+#endif
+
   struct MessagePort {
     // sender and route_id are what we need to send messages to the port.
     IPC::Message::Sender* sender;
     int route_id;
     // A function pointer to generate a new route id for the sender above.
     // Owned by "sender" above, so don't delete.
     CallbackWithReturnValue<int>::Type* next_routing_id;
     // A globally unique id for this message port.
     int message_port_id;
     // The globally unique id of the entangled message port.
@@ skipping 12 matching lines @@
   // Valid only during IPC message dispatching.
   IPC::Message::Sender* sender_;
   CallbackWithReturnValue<int>::Type* next_routing_id_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePortDispatcher);
 };
 
 #endif  // CHROME_BROWSER_WORKER_HOST_MESSAGE_PORT_DISPATCHER_H_