Fix net_export.h includes.

net/spdy/http2_priority_dependencies.h

 // 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.
 
 #ifndef NET_HTTP2_PRIORITY_DEPENDENCIES_H_
 #define NET_HTTP2_PRIORITY_DEPENDENCIES_H_
 
 #include <list>
 #include <map>
 
+#include "net/base/net_export.h"
 #include "net/spdy/spdy_protocol.h"
 
 namespace net {
 
 // A helper class encapsulating the state and logic to set dependencies of
 // HTTP2 streams based on their SpdyPriority and the ordering
 // of creation and deletion of the streams.
 class NET_EXPORT_PRIVATE Http2PriorityDependencies {
  public:
   Http2PriorityDependencies();
@@ skipping 30 matching lines @@
 
   // Tracks the location of an id anywhere in the above vector of lists.
   // Iterators to list elements remain valid until those particular elements
   // are erased.
   EntryMap entry_by_stream_id_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP2_PRIORITY_DEPENDENCIES_H_