Remove TCPPort incoming_only_ member.

TCPPort's incoming_only_ member seems unused and there was a TODO
about this. This CL just removes it.

Bug: webrtc:10198
Change-Id: I216c291159a32fa2924309affa3769a4be116fd0
Reviewed-on: https://webrtc-review.googlesource.com/c/120931
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26538}

p2p/base/tcp_port.cc

@@ -97,7 +97,6 @@ TCPPort::TCPPort(rtc::Thread* thread,
            max_port,
            username,
            password),
-      incoming_only_(false),
       allow_listen_(allow_listen),
       socket_(NULL),
       error_(0) {
@@ -133,10 +132,6 @@ Connection* TCPPort::CreateConnection(const Candidate& address,
   if (origin == ORIGIN_OTHER_PORT)
     return NULL;
 
-  // Check if we are allowed to make outgoing TCP connections
-  if (incoming_only_ && (origin == ORIGIN_MESSAGE))
-    return NULL;
-
   // We don't know how to act as an ssl server yet
   if ((address.protocol() == SSLTCP_PROTOCOL_NAME) &&
       (origin == ORIGIN_THIS_PORT)) {

p2p/base/tcp_port.h

@@ -104,8 +104,6 @@ class TCPPort : public Port {
   void OnAddressReady(rtc::AsyncPacketSocket* socket,
                       const rtc::SocketAddress& address);
 
-  // TODO(?): Is this still needed?
-  bool incoming_only_;
   bool allow_listen_;
   rtc::AsyncPacketSocket* socket_;
   int error_;