Fix net_export.h includes.

net/quic/core/quic_client_session_base.h

 // Copyright 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.
 
 #ifndef NET_QUIC_QUIC_CLIENT_SESSION_BASE_H_
 #define NET_QUIC_QUIC_CLIENT_SESSION_BASE_H_
 
 #include <string>
 
 #include "base/macros.h"
+#include "net/base/net_export.h"
 #include "net/quic/core/quic_crypto_client_stream.h"
 #include "net/quic/core/quic_spdy_session.h"
 
 namespace net {
 
 class QuicClientPromisedInfo;
 class QuicClientPushPromiseIndex;
 class QuicSpdyClientStream;
 
 // For client/http layer code. Lookup promised streams based on
@@ skipping 109 matching lines @@
   QuicClientPushPromiseIndex* push_promise_index_;
   QuicPromisedByIdMap promised_by_id_;
   QuicStreamId largest_promised_stream_id_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicClientSessionBase);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CLIENT_SESSION_BASE_H_