Change the interface of GetAlternativeServicesFor, always return the best Alt-Svc entry.

net/http/http_stream_factory_impl.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_STREAM_FACTORY_IMPL_H_
 #define NET_HTTP_HTTP_STREAM_FACTORY_IMPL_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 56 matching lines @@
 
   HttpStreamRequest* RequestStreamInternal(
       const HttpRequestInfo& info,
       RequestPriority priority,
       const SSLConfig& server_ssl_config,
       const SSLConfig& proxy_ssl_config,
       HttpStreamRequest::Delegate* delegate,
       WebSocketHandshakeStreamBase::CreateHelper* create_helper,
       const BoundNetLog& net_log);
 
-  AlternativeServiceVector GetAlternativeServicesFor(
-      const GURL& original_url,
+  AlternativeService GetAlternativeServiceFor(
+      const HttpRequestInfo& request_info,
       HttpStreamRequest::Delegate* delegate);
 
   // Detaches |job| from |request|.
   void OrphanJob(Job* job, const Request* request);
 
   // Called when a SpdySession is ready. It will find appropriate Requests and
   // fulfill them. |direct| indicates whether or not |spdy_session| uses a
   // proxy.
   void OnNewSpdySessionReady(const base::WeakPtr<SpdySession>& spdy_session,
                              bool direct,
@@ skipping 39 matching lines @@
   // deleted when the factory is destroyed.
   std::set<const Job*> preconnect_job_set_;
 
   const bool for_websockets_;
   DISALLOW_COPY_AND_ASSIGN(HttpStreamFactoryImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_FACTORY_IMPL_H_