Remove vestigal SDCH stuff in IOThread.

chrome/browser/io_thread.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 CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 38 matching lines @@
 class HostMappingRules;
 class HostResolver;
 class HttpAuthHandlerFactory;
 class HttpServerProperties;
 class HttpTransactionFactory;
 class HttpUserAgentSettings;
 class NetworkDelegate;
 class ServerBoundCertService;
 class ProxyConfigService;
 class ProxyService;
-class SdchManager;
 class SSLConfigService;
 class TransportSecurityState;
 class URLRequestContext;
 class URLRequestContextGetter;
 class URLRequestJobFactory;
 class URLRequestThrottlerManager;
 class URLSecurityManager;
 }  // namespace net
 
 namespace policy {
@@ skipping 291 matching lines @@
 
   // These member variables are initialized by a task posted to the IO thread,
   // which gets posted by calling certain member functions of IOThread.
   scoped_ptr<net::ProxyConfigService> system_proxy_config_service_;
 
   scoped_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker_;
 
   scoped_refptr<net::URLRequestContextGetter>
       system_url_request_context_getter_;
 
-  net::SdchManager* sdch_manager_;
-
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   const base::TimeTicks creation_time_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_