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

content/shell/shell_network_delegate.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 CONTENT_SHELL_SHELL_NETWORK_DELEGATE_H_
 #define CONTENT_SHELL_SHELL_NETWORK_DELEGATE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 36 matching lines @@
       const net::AuthChallengeInfo& auth_info,
       const AuthCallback& callback,
       net::AuthCredentials* credentials) OVERRIDE;
   virtual bool OnCanGetCookies(const net::URLRequest& request,
                                const net::CookieList& cookie_list) OVERRIDE;
   virtual bool OnCanSetCookie(const net::URLRequest& request,
                               const std::string& cookie_line,
                               net::CookieOptions* options) OVERRIDE;
   virtual bool OnCanAccessFile(const net::URLRequest& request,
                                const FilePath& path) const OVERRIDE;
+  virtual bool OnCanThrottleRequest(
+      const net::URLRequest& request) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ShellNetworkDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_NETWORK_DELEGATE_H_