Make Port (and subclasses) fully "Network"-based, instead of IP-based.

webrtc/p2p/base/port.h

Index: webrtc/p2p/base/port.h
diff --git a/webrtc/p2p/base/port.h b/webrtc/p2p/base/port.h
index 576473850857550619f832db0aefc6ae2ff1ab8a..8563805ce22f5e18b47b810e7a4a382f905bbd73 100644
--- a/webrtc/p2p/base/port.h
+++ b/webrtc/p2p/base/port.h
@@ -142,14 +142,12 @@ class Port : public PortInterface, public rtc::MessageHandler,
        const std::string& type,
        rtc::PacketSocketFactory* factory,
        rtc::Network* network,
-       const rtc::IPAddress& ip,
        const std::string& username_fragment,
        const std::string& password);
   Port(rtc::Thread* thread,
        const std::string& type,
        rtc::PacketSocketFactory* factory,
        rtc::Network* network,
-       const rtc::IPAddress& ip,
        uint16_t min_port,
        uint16_t max_port,
        const std::string& username_fragment,
@@ -283,7 +281,6 @@ class Port : public PortInterface, public rtc::MessageHandler,
 
   // Debugging description of this port
   virtual std::string ToString() const;
-  const rtc::IPAddress& ip() const { return ip_; }
   uint16_t min_port() { return min_port_; }
   uint16_t max_port() { return max_port_; }
 
@@ -397,7 +394,6 @@ class Port : public PortInterface, public rtc::MessageHandler,
   std::string type_;
   bool send_retransmit_count_attribute_;
   rtc::Network* network_;
-  rtc::IPAddress ip_;
   uint16_t min_port_;
   uint16_t max_port_;
   std::string content_name_;