[net] Move DnsConfigService to NetworkChangeNotifier.

net/dns/dns_test_util.cc

Index: net/dns/dns_test_util.cc
diff --git a/net/dns/dns_test_util.cc b/net/dns/dns_test_util.cc
index 73d208c61519cd9d5f25f91e39cab01a564e9bb7..86633708e7242d0302de336eba26d6138a7d78d5 100644
--- a/net/dns/dns_test_util.cc
+++ b/net/dns/dns_test_util.cc
@@ -208,18 +208,4 @@ scoped_ptr<DnsClient> CreateMockDnsClient(const DnsConfig& config,
   return scoped_ptr<DnsClient>(new MockDnsClient(config, rules));
 }
 
-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