Move shared files in net/quic/ into net/quic/core/

net/quic/test_tools/quic_headers_stream_peer.cc

 // Copyright 2016 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/test_tools/quic_headers_stream_peer.h"
 
-#include "net/quic/quic_headers_stream.h"
+#include "net/quic/core/quic_headers_stream.h"
 
 namespace net {
 namespace test {
 
 // static
 const SpdyFramer& QuicHeadersStreamPeer::GetSpdyFramer(
     QuicHeadersStream* stream) {
   return stream->spdy_framer_;
 }
 
 }  // namespace test
 }  // namespace net