Move EnableSpdy from HttpNetworkLayer to IOThread.

net/http/http_network_layer.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_LAYER_H_
 #define NET_HTTP_HTTP_NETWORK_LAYER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 18 matching lines @@
   virtual ~HttpNetworkLayer();
 
   // Create a transaction factory that instantiate a network layer over an
   // existing network session. Network session contains some valuable
   // information (e.g. authentication data) that we want to share across
   // multiple network layers. This method exposes the implementation details
   // of a network layer, use this method with an existing network layer only
   // when network session is shared.
   static HttpTransactionFactory* CreateFactory(HttpNetworkSession* session);
 
-  // Enable the spdy protocol.
-  // Without calling this function, SPDY is disabled.  The mode can be:
-  //   ""            : (default) SSL and compression are enabled, flow
-  //                   control disabled.
-  //   "no-ssl"      : disables SSL.
-  //   "no-compress" : disables compression.
-  //   "flow-control": enables flow control.
-  //   "none"        : disables both SSL and compression.
-  static void EnableSpdy(const std::string& mode);
+  // Forces an alternate protocol of SPDY/2 on port 443.
+  // TODO(rch): eliminate this method.
+  static void ForceAlternateProtocol();
 
   // HttpTransactionFactory methods:
   virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans,
                                 HttpTransactionDelegate* delegate) OVERRIDE;
   virtual HttpCache* GetCache() OVERRIDE;
   virtual HttpNetworkSession* GetSession() OVERRIDE;
 
   // base::SystemMonitor::PowerObserver methods:
   virtual void OnSuspend() OVERRIDE;
   virtual void OnResume() OVERRIDE;
 
  private:
   const scoped_refptr<HttpNetworkSession> session_;
   bool suspended_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_LAYER_H_