Remove SPDY 2.1 support.

net/http/http_stream_factory.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_H_
 #define NET_HTTP_HTTP_STREAM_FACTORY_H_
 
 #include <list>
 #include <string>
 #include <vector>
@@ skipping 212 matching lines @@
   static void set_force_spdy_always(bool value) {
     force_spdy_always_ = value;
   }
   static bool force_spdy_always() { return force_spdy_always_; }
 
   // Add a URL to exclude from forced SPDY.
   static void add_forced_spdy_exclusion(const std::string& value);
   // Check if a HostPortPair is excluded from using spdy.
   static bool HasSpdyExclusion(const HostPortPair& endpoint);
 
+  // Sets http/1.1 as the only protocol supported via NPN.
+  static void EnableNpnHttpOnly();
+
   // Sets http/1.1 and spdy/2 (the default spdy protocol) as the protocols
-  // supported.
+  // supported via NPN.
   static void EnableNpnSpdy();
 
-  // Sets http/1.1 as the protocols supported.
-  static void EnableNpnHttpOnly();
-
-  // Sets http/1.1, spdy/2 and spdy/2.1 as the protocols supported.
-  // If flow-control is enabled, received WINDOW_UPDATE and SETTINGS messages
-  // are processed and outstanding window size is actually obeyed when sending
-  // data frames, and WINDOW_UPDATE messages are generated when data is
-  // consumed.
-  static void EnableFlowControl();
-
-  // Sets http/1.1, spdy/2, spdy/2.1 and spdy/3 as the protocols supported.
+  // Sets http/1.1, spdy/2, and spdy/3 as the protocols supported via NPN.
   static void EnableNpnSpdy3();
 
   // Sets the protocols supported by NPN (next protocol negotiation) during the
   // SSL handshake as well as by HTTP Alternate-Protocol.
   static void SetNextProtos(const std::vector<std::string>& value);
   static bool has_next_protos() { return next_protos_ != NULL; }
   static const std::vector<std::string>& next_protos() {
     return *next_protos_;
   }
 
@@ skipping 41 matching lines @@
   static bool http_pipelining_enabled_;
   static uint16 testing_fixed_http_port_;
   static uint16 testing_fixed_https_port_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpStreamFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_STREAM_FACTORY_H_