Update from chromium https://crrev.com/301725/

net/dns/mdns_client_impl.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 NET_DNS_MDNS_CLIENT_IMPL_H_
 #define NET_DNS_MDNS_CLIENT_IMPL_H_
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_vector.h"
 #include "base/observer_list.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/dns/mdns_cache.h"
 #include "net/dns/mdns_client.h"
 #include "net/udp/datagram_server_socket.h"
 #include "net/udp/udp_server_socket.h"
 #include "net/udp/udp_socket.h"
 
 namespace net {
 
 class MDnsSocketFactoryImpl : public MDnsSocketFactory {
  public:
   MDnsSocketFactoryImpl() {};
-  virtual ~MDnsSocketFactoryImpl() {};
+  ~MDnsSocketFactoryImpl() override{};
 
-  virtual void CreateSockets(
-      ScopedVector<DatagramServerSocket>* sockets) override;
+  void CreateSockets(ScopedVector<DatagramServerSocket>* sockets) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MDnsSocketFactoryImpl);
 };
 
 // A connection to the network for multicast DNS clients. It reads data into
 // DnsResponse objects and alerts the delegate that a packet has been received.
 class NET_EXPORT_PRIVATE MDnsConnection {
  public:
   class Delegate {
@@ skipping 61 matching lines @@
 
 class NET_EXPORT_PRIVATE MDnsClientImpl : public MDnsClient {
  public:
   // The core object exists while the MDnsClient is listening, and is deleted
   // whenever the number of listeners reaches zero. The deletion happens
   // asychronously, so destroying the last listener does not immediately
   // invalidate the core.
   class Core : public base::SupportsWeakPtr<Core>, MDnsConnection::Delegate {
    public:
     explicit Core(MDnsClientImpl* client);
-    virtual ~Core();
+    ~Core() override;
 
     // Initialize the core. Returns true on success.
     bool Init(MDnsSocketFactory* socket_factory);
 
     // Send a query with a specific rrtype and name. Returns true on success.
     bool SendQuery(uint16 rrtype, std::string name);
 
     // Add/remove a listener to the list of listeners.
     void AddListener(MDnsListenerImpl* listener);
     void RemoveListener(MDnsListenerImpl* listener);
 
     // Query the cache for records of a specific type and name.
     void QueryCache(uint16 rrtype, const std::string& name,
                     std::vector<const RecordParsed*>* records) const;
 
     // Parse the response and alert relevant listeners.
-    virtual void HandlePacket(DnsResponse* response, int bytes_read) override;
+    void HandlePacket(DnsResponse* response, int bytes_read) override;
 
-    virtual void OnConnectionError(int error) override;
+    void OnConnectionError(int error) override;
 
    private:
     typedef std::pair<std::string, uint16> ListenerKey;
     typedef std::map<ListenerKey, ObserverList<MDnsListenerImpl>* >
     ListenerMap;
 
     // Alert listeners of an update to the cache.
     void AlertListeners(MDnsCache::UpdateType update_type,
                         const ListenerKey& key, const RecordParsed* record);
 
@@ skipping 19 matching lines @@
 
     base::CancelableClosure cleanup_callback_;
     base::Time scheduled_cleanup_;
 
     scoped_ptr<MDnsConnection> connection_;
 
     DISALLOW_COPY_AND_ASSIGN(Core);
   };
 
   MDnsClientImpl();
-  virtual ~MDnsClientImpl();
+  ~MDnsClientImpl() override;
 
   // MDnsClient implementation:
-  virtual scoped_ptr<MDnsListener> CreateListener(
+  scoped_ptr<MDnsListener> CreateListener(
       uint16 rrtype,
       const std::string& name,
       MDnsListener::Delegate* delegate) override;
 
-  virtual scoped_ptr<MDnsTransaction> CreateTransaction(
+  scoped_ptr<MDnsTransaction> CreateTransaction(
       uint16 rrtype,
       const std::string& name,
       int flags,
       const MDnsTransaction::ResultCallback& callback) override;
 
-  virtual bool StartListening(MDnsSocketFactory* socket_factory) override;
-  virtual void StopListening() override;
-  virtual bool IsListening() const override;
+  bool StartListening(MDnsSocketFactory* socket_factory) override;
+  void StopListening() override;
+  bool IsListening() const override;
 
   Core* core() { return core_.get(); }
 
  private:
   scoped_ptr<Core> core_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsClientImpl);
 };
 
 class MDnsListenerImpl : public MDnsListener,
                          public base::SupportsWeakPtr<MDnsListenerImpl> {
  public:
   MDnsListenerImpl(uint16 rrtype,
                    const std::string& name,
                    MDnsListener::Delegate* delegate,
                    MDnsClientImpl* client);
 
-  virtual ~MDnsListenerImpl();
+  ~MDnsListenerImpl() override;
 
   // MDnsListener implementation:
-  virtual bool Start() override;
+  bool Start() override;
 
   // Actively refresh any received records.
-  virtual void SetActiveRefresh(bool active_refresh) override;
+  void SetActiveRefresh(bool active_refresh) override;
 
-  virtual const std::string& GetName() const override;
+  const std::string& GetName() const override;
 
-  virtual uint16 GetType() const override;
+  uint16 GetType() const override;
 
   MDnsListener::Delegate* delegate() { return delegate_; }
 
   // Alert the delegate of a record update.
   void HandleRecordUpdate(MDnsCache::UpdateType update_type,
                           const RecordParsed* record_parsed);
 
   // Alert the delegate of the existence of an Nsec record.
   void AlertNsecRecord();
 
@@ skipping 17 matching lines @@
 
 class MDnsTransactionImpl : public base::SupportsWeakPtr<MDnsTransactionImpl>,
                             public MDnsTransaction,
                             public MDnsListener::Delegate {
  public:
   MDnsTransactionImpl(uint16 rrtype,
                       const std::string& name,
                       int flags,
                       const MDnsTransaction::ResultCallback& callback,
                       MDnsClientImpl* client);
-  virtual ~MDnsTransactionImpl();
+  ~MDnsTransactionImpl() override;
 
   // MDnsTransaction implementation:
-  virtual bool Start() override;
+  bool Start() override;
 
-  virtual const std::string& GetName() const override;
-  virtual uint16 GetType() const override;
+  const std::string& GetName() const override;
+  uint16 GetType() const override;
 
   // MDnsListener::Delegate implementation:
-  virtual void OnRecordUpdate(MDnsListener::UpdateType update,
-                              const RecordParsed* record) override;
-  virtual void OnNsecRecord(const std::string& name, unsigned type) override;
+  void OnRecordUpdate(MDnsListener::UpdateType update,
+                      const RecordParsed* record) override;
+  void OnNsecRecord(const std::string& name, unsigned type) override;
 
-  virtual void OnCachePurged() override;
+  void OnCachePurged() override;
 
  private:
   bool is_active() { return !callback_.is_null(); }
 
   void Reset();
 
   // Trigger the callback and reset all related variables.
   void TriggerCallback(MDnsTransaction::Result result,
                        const RecordParsed* record);
 
@@ skipping 22 matching lines @@
   MDnsClientImpl* client_;
 
   bool started_;
   int flags_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsTransactionImpl);
 };
 
 }  // namespace net
 #endif  // NET_DNS_MDNS_CLIENT_IMPL_H_