Remove a bunch of unused network flags.

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 138 matching lines @@
         extension_event_router_forwarder;
     scoped_ptr<chrome_browser_net::HttpPipeliningCompatibilityClient>
         http_pipelining_compatibility_client;
     scoped_ptr<net::HostMappingRules> host_mapping_rules;
     scoped_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
     bool ignore_certificate_errors;
     bool http_pipelining_enabled;
     uint16 testing_fixed_http_port;
     uint16 testing_fixed_https_port;
     Optional<size_t> initial_max_spdy_concurrent_streams;
-    Optional<size_t> max_spdy_concurrent_streams_limit;
     Optional<bool> force_spdy_single_domain;
     Optional<bool> enable_spdy_ip_pooling;
     Optional<bool> enable_spdy_compression;
     Optional<bool> enable_spdy_ping_based_connection_checking;
     Optional<net::NextProto> spdy_default_protocol;
     Optional<string> trusted_spdy_proxy;
     Optional<bool> enable_quic;
     Optional<bool> enable_quic_https;
     Optional<bool> enable_quic_port_selection;
     Optional<size_t> quic_max_packet_length;
@@ skipping 174 matching lines @@
 
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_