Split HttpNetworkSession::Params into two structs.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 273 matching lines @@
   // These member variables are basically global, but their lifetimes are tied
   // to the IOThread.  IOThread owns them all, despite not using scoped_ptr.
   // This is because the destructor of IOThread runs on the wrong thread.  All
   // member variables should be deleted in CleanUp().
 
   // These member variables are initialized in Init() and do not change for the
   // lifetime of the IO thread.
 
   Globals* globals_;
 
-  net::HttpNetworkSession::Params params_;
+  net::HttpNetworkSession::Params session_params_;
 
   // Observer that logs network changes to the ChromeNetLog.
   std::unique_ptr<net::LoggingNetworkChangeObserver> network_change_observer_;
 
   std::unique_ptr<certificate_transparency::TreeStateTracker> ct_tree_tracker_;
 
   BooleanPrefMember system_enable_referrers_;
 
   BooleanPrefMember dns_client_enabled_;
 
@@ skipping 45 matching lines @@
   bool http_09_on_non_default_ports_enabled_;
 
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_