Remove the unused QUIC port selection logic.

net/quic/chromium/port_suggester.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_QUIC_PORT_SUGGESTER_H_
-#define NET_QUIC_PORT_SUGGESTER_H_
-
-#include <stdint.h>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/sha1.h"
-#include "net/base/host_port_pair.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-// We provide a pseudo-random number generator that is always seeded the same
-// way for a given destination host-port pair.  The generator is used to
-// consistently suggest (for that host-port pair) an ephemeral source port,
-// and hence increase the likelihood that a server's load balancer will direct
-// a repeated connection to the same server (with QUIC, further increasing the
-// chance of connection establishment with 0-RTT).
-class NET_EXPORT_PRIVATE PortSuggester
-    : public base::RefCounted<PortSuggester> {
- public:
-  PortSuggester(const HostPortPair& server, uint64_t seed);
-
-  // Generate a pseudo-random int in the inclusive range from |min| to |max|.
-  // Will (probably) return different numbers when called repeatedly.
-  int SuggestPort(int min, int max);
-
-  uint32_t call_count() const { return call_count_; }
-  int previous_suggestion() const;
-
- private:
-  friend class base::RefCounted<PortSuggester>;
-
-  virtual ~PortSuggester() {}
-
-  // We maintain the first 8 bytes of a hash as our seed_ state.
-  uint64_t seed_;
-  uint32_t call_count_;  // Number of suggestions made.
-  int previous_suggestion_;
-
-  DISALLOW_COPY_AND_ASSIGN(PortSuggester);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_PORT_SUGGESTER_H_