[net] Move DnsConfigService to NetworkChangeNotifier.

net/dns/dns_test_util.h

Index: net/dns/dns_test_util.h
diff --git a/net/dns/dns_test_util.h b/net/dns/dns_test_util.h
index 2d03d0e654021eb7b0bfaf5ad443c56325110c12..1d9e067b85263af7de4614ca55f95e58cc057097 100644
--- a/net/dns/dns_test_util.h
+++ b/net/dns/dns_test_util.h
@@ -189,19 +189,6 @@ typedef std::vector<MockDnsClientRule> MockDnsClientRuleList;
 scoped_ptr<DnsClient> CreateMockDnsClient(const DnsConfig& config,
                                           const MockDnsClientRuleList& rules);
 
-class MockDnsConfigService : public DnsConfigService {
- public:
-  virtual ~MockDnsConfigService();
-
-  // NetworkChangeNotifier::DNSObserver:
-  virtual void OnDNSChanged(unsigned detail) OVERRIDE;
-
-  // Expose the protected methods for tests.
-  void ChangeConfig(const DnsConfig& config);
-  void ChangeHosts(const DnsHosts& hosts);
-};
-
-
 }  // namespace net
 
 #endif  // NET_DNS_DNS_TEST_UTIL_H_