Moves QuicTag typedefs, and QuicTag utility methods to quic_tag.{h,cc}. No behavior change.

net/quic/core/congestion_control/prr_sender_test.cc

 // Copyright (c) 2014 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/core/congestion_control/prr_sender.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/quic/core/quic_bandwidth.h"
+#include "net/quic/core/quic_constants.h"
 #include "net/quic/core/quic_protocol.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
 namespace {
 // Constant based on TCP defaults.
 const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS;
 }  // namespace
@@ skipping 103 matching lines @@
               prr.TimeUntilSend(congestion_window, bytes_in_flight,
                                 ssthresh_after_loss * kMaxSegmentSize));
     // Send a packet in response.
     prr.OnPacketSent(kMaxSegmentSize);
     bytes_in_flight += kMaxSegmentSize;
   }
 }
 
 }  // namespace test
 }  // namespace net