Introduce net::HttpServerPropertiesManager to manage server-specific properties.

chrome/browser/profiles/off_the_record_profile_impl.cc

Index: chrome/browser/profiles/off_the_record_profile_impl.cc
===================================================================
--- chrome/browser/profiles/off_the_record_profile_impl.cc	(revision 99284)
+++ chrome/browser/profiles/off_the_record_profile_impl.cc	(working copy)
@@ -381,6 +381,10 @@
     return io_data_.GetResourceContext();
   }
 
+  virtual net::SpdyConfigService* GetSpdyConfigService() {
+    return profile_->GetSpdyConfigService();
+  }
+
   virtual net::SSLConfigService* GetSSLConfigService() {
     return profile_->GetSSLConfigService();
   }