Introduce a delegate to avoid hardcoding "chrome-extension" in net/.

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_
 #pragma once
 
 #include <string>
 
@@ skipping 29 matching lines @@
 class NetworkDelegate;
 class ServerBoundCertService;
 class ProxyConfigService;
 class ProxyService;
 class SdchManager;
 class SSLConfigService;
 class TransportSecurityState;
 class URLRequestContext;
 class URLRequestContextGetter;
 class URLRequestThrottlerManager;
+class URLRequestThrottlerManagerDelegate;
 class URLSecurityManager;
 }  // namespace net
 
 // Contains state associated with, initialized and cleaned up on, and
 // primarily used on, the IO thread.
 //
 // If you are looking to interact with the IO thread (e.g. post tasks
 // to it or check if it is the current thread), see
 // content::BrowserThread.
 class IOThread : public content::BrowserThreadDelegate {
@@ skipping 20 matching lines @@
     // pins.
     scoped_ptr<net::TransportSecurityState> transport_security_state;
     scoped_refptr<net::SSLConfigService> ssl_config_service;
     scoped_ptr<net::HttpAuthHandlerFactory> http_auth_handler_factory;
     scoped_ptr<net::HttpServerProperties> http_server_properties;
     scoped_ptr<net::ProxyService> proxy_script_fetcher_proxy_service;
     scoped_ptr<net::HttpTransactionFactory>
         proxy_script_fetcher_http_transaction_factory;
     scoped_ptr<net::FtpTransactionFactory>
         proxy_script_fetcher_ftp_transaction_factory;
+    scoped_ptr<net::URLRequestThrottlerManagerDelegate>
+        throttler_manager_delegate;
     scoped_ptr<net::URLRequestThrottlerManager> throttler_manager;
     scoped_ptr<net::URLSecurityManager> url_security_manager;
     // TODO(willchan): Remove proxy script fetcher context since it's not
     // necessary now that I got rid of refcounting URLRequestContexts.
     //
     // The first URLRequestContext is |system_url_request_context|. We introduce
     // |proxy_script_fetcher_context| for the second context. It has a direct
     // ProxyService, since we always directly connect to fetch the PAC script.
     scoped_ptr<net::URLRequestContext> proxy_script_fetcher_context;
     scoped_ptr<net::ProxyService> system_proxy_service;
@@ skipping 111 matching lines @@
       system_url_request_context_getter_;
 
   net::SdchManager* sdch_manager_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_