Update a bug number referenced by some TODOs, to point at the new bug for tra...

net/base/host_resolver.h

 // Copyright (c) 2006-2008 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 NET_BASE_HOST_RESOLVER_H_
 #define NET_BASE_HOST_RESOLVER_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
@@ skipping 108 matching lines @@
   virtual void CancelRequest(RequestHandle req) = 0;
 
   // Adds an observer to this resolver. The observer will be notified of the
   // start and completion of all requests (excluding cancellation). |observer|
   // must remain valid for the duration of this HostResolver's lifetime.
   virtual void AddObserver(Observer* observer) = 0;
 
   // Unregisters an observer previously added by AddObserver().
   virtual void RemoveObserver(Observer* observer) = 0;
 
-  // TODO(eroman): temp hack for http://crbug.com/15513
+  // TODO(eroman): temp hack for http://crbug.com/18373
   virtual void Shutdown() = 0;
 
   DISALLOW_COPY_AND_ASSIGN(HostResolver);
 };
 
 // This class represents the task of resolving a hostname (or IP address
 // literal) to an AddressList object.  It wraps HostResolver to resolve only a
 // single hostname at a time and cancels this request when going out of scope.
 class SingleRequestHostResolver {
  public:
@@ skipping 28 matching lines @@
 };
 
 // Creates a HostResolver implementation that queries the underlying system.
 // (Except if a unit-test has changed the global HostResolverProc using
 // ScopedHostResolverProc to intercept requests to the system).
 HostResolver* CreateSystemHostResolver();
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_H_