Revert 221619 "Initial chrome.mdns API."

trunk/src/chrome/browser/extensions/api/mdns/dns_sd_registry.h

-// Copyright 2013 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 CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_
-#define CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_
-
-#include <string>
-#include <vector>
-
-#include "base/observer_list.h"
-
-namespace extensions {
-
-// Network Service Discovery registry class for keeping track of discovered
-// network services.
-class DnsSdRegistry {
- public:
-  typedef std::vector<std::string> DnsSdServiceList;
-
-  class DnsSdObserver {
-   public:
-    virtual void OnDnsSdEvent(const std::string& service_type,
-                              const DnsSdServiceList& services) = 0;
-
-   protected:
-    virtual ~DnsSdObserver() {}
-  };
-
-  explicit DnsSdRegistry();
-  virtual ~DnsSdRegistry();
-
-  // Observer registration for parties interested in discovery events.
-  virtual void AddObserver(DnsSdObserver* observer);
-  virtual void RemoveObserver(DnsSdObserver* observer);
-
-  // DNS-SD-related discovery functionality.
-  virtual void RegisterDnsSdListener(std::string service_type);
-  virtual void UnregisterDnsSdListener(std::string service_type);
-
- protected:
-  ObserverList<DnsSdObserver> observers_;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_API_MDNS_DNS_SD_REGISTRY_H_