Remove the unused QUIC port selection logic.

net/quic/chromium/port_suggester.cc

-// 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.
-
-#include "net/quic/chromium/port_suggester.h"
-
-#include "base/logging.h"
-
-namespace net {
-
-PortSuggester::PortSuggester(const HostPortPair& server, uint64_t seed)
-    : call_count_(0), previous_suggestion_(-1) {
-  unsigned char hash_bytes[base::kSHA1Length];
-  base::SHA1HashBytes(
-      reinterpret_cast<const unsigned char*>(server.host().data()),
-      server.host().length(), hash_bytes);
-  static_assert(sizeof(seed_) < sizeof(hash_bytes), "seed larger than hash");
-  memcpy(&seed_, hash_bytes, sizeof(seed_));
-  seed_ ^= seed ^ server.port();
-}
-
-int PortSuggester::SuggestPort(int min, int max) {
-  // Sometimes our suggestion can't be used, so we ensure that if additional
-  // calls are made, then each call (probably) provides a new suggestion.
-  if (++call_count_ > 1) {
-    // Evolve the seed.
-    unsigned char hash_bytes[base::kSHA1Length];
-    base::SHA1HashBytes(reinterpret_cast<const unsigned char*>(&seed_),
-                        sizeof(seed_), hash_bytes);
-    memcpy(&seed_, hash_bytes, sizeof(seed_));
-  }
-  DCHECK_LE(min, max);
-  DCHECK_GT(min, 0);
-  int range = max - min + 1;
-  // Ports (and hence the extent of the |range|) are generally under 2^16, so
-  // the tiny non-uniformity in the pseudo-random distribution is not
-  // significant.
-  previous_suggestion_ = static_cast<int>(seed_ % range) + min;
-  return previous_suggestion_;
-}
-
-int PortSuggester::previous_suggestion() const {
-  DCHECK_LT(0u, call_count_);
-  return previous_suggestion_;
-}
-
-}  // namespace net