Remove vestigal SDCH stuff in IOThread.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index 0c9219e7a2d4a74b657696c34e395ac91ae6dd43..7b3e2032c4b4115880a446bb5133652d41359b4e 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -56,7 +56,6 @@ class NetworkDelegate;
 class ServerBoundCertService;
 class ProxyConfigService;
 class ProxyService;
-class SdchManager;
 class SSLConfigService;
 class TransportSecurityState;
 class URLRequestContext;
@@ -368,8 +367,6 @@ class IOThread : public content::BrowserThreadDelegate {
   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_;