Massively simplify the NetworkChangeNotifier infrastructure:...

net/base/host_resolver_impl.h

Index: net/base/host_resolver_impl.h
===================================================================
--- net/base/host_resolver_impl.h	(revision 50775)
+++ net/base/host_resolver_impl.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -73,13 +73,10 @@
   // thread-safe since it is run from multiple worker threads. If
   // |resolver_proc| is NULL then the default host resolver procedure is
   // used (which is SystemHostResolverProc except if overridden).
-  // |notifier| must outlive HostResolverImpl.  It can optionally be NULL, in
-  // which case HostResolverImpl will not respond to network changes.
   // |max_jobs| specifies the maximum number of threads that the host resolver
   // will use. Use SetPoolConstraints() to specify finer-grain settings.
   HostResolverImpl(HostResolverProc* resolver_proc,
                    HostCache* cache,
-                   NetworkChangeNotifier* notifier,
                    size_t max_jobs);
 
   // HostResolver methods:
@@ -247,8 +244,6 @@
   // TODO(eroman): hack for http://crbug.com/15513
   bool shutdown_;
 
-  NetworkChangeNotifier* const network_change_notifier_;
-
   // Indicate if probing is done after each network change event to set address
   // family.
   // When false, explicit setting of address family is used.