[net/dns] Isolate DnsConfigWatcher from DnsConfigService.

net/dns/dns_test_util.cc

 // 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.
 
 #include "net/dns/dns_test_util.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 145 matching lines @@
   MockTransactionFactory factory_;
 };
 
 }  // namespace
 
 // static
 scoped_ptr<DnsClient> CreateMockDnsClient(const DnsConfig& config) {
   return scoped_ptr<DnsClient>(new MockDnsClient(config));
 }
 
-void MockDnsConfigService::Watch(const CallbackType& callback) {
-  set_callback(callback);
+MockDnsConfigService::~MockDnsConfigService() {
+}
+
+void MockDnsConfigService::OnDNSChanged(unsigned detail) {
+}
+
+void MockDnsConfigService::ChangeConfig(const DnsConfig& config) {
+  DnsConfigService::OnConfigRead(config);
+}
+
+void MockDnsConfigService::ChangeHosts(const DnsHosts& hosts) {
+  DnsConfigService::OnHostsRead(hosts);
 }
 
 }  // namespace net