Update from https://crrev.com/308331

net/http/http_network_session.h

 // Copyright (c) 2012 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_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 187 matching lines @@
   base::Value* QuicInfoToValue() const;
 
   void CloseAllConnections();
   void CloseIdleConnections();
 
   // Returns the original Params used to construct this session.
   const Params& params() const { return params_; }
 
   bool IsProtocolEnabled(AlternateProtocol protocol) const;
 
-  void GetNextProtos(std::vector<std::string>* next_protos) const;
+  // Populates |*next_protos| with protocols.
+  void GetNextProtos(NextProtoVector* next_protos) const;
 
   // Convenience function for searching through |params_| for
   // |forced_spdy_exclusions|.
   bool HasSpdyExclusion(HostPortPair host_port_pair) const;
 
  private:
   friend class base::RefCounted<HttpNetworkSession>;
   friend class HttpNetworkSessionPeer;
 
   ~HttpNetworkSession();
@@ skipping 16 matching lines @@
   scoped_ptr<ClientSocketPoolManager> websocket_socket_pool_manager_;
   QuicStreamFactory quic_stream_factory_;
   SpdySessionPool spdy_session_pool_;
   scoped_ptr<HttpStreamFactory> http_stream_factory_;
   scoped_ptr<HttpStreamFactory> http_stream_factory_for_websocket_;
   std::set<HttpResponseBodyDrainer*> response_drainers_;
 
   // TODO(jgraettinger): Remove when Huffman collection is complete.
   scoped_ptr<HpackHuffmanAggregator> huffman_aggregator_;
 
-  std::vector<std::string> next_protos_;
+  NextProtoVector next_protos_;
   bool enabled_protocols_[NUM_VALID_ALTERNATE_PROTOCOLS];
 
   Params params_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_