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

content/shell/shell_network_delegate.cc

 // 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.
 
 #include "content/shell/shell_network_delegate.h"
 
 #include "net/base/net_errors.h"
 
 namespace content {
 
@@ skipping 68 matching lines @@
                                           const std::string& cookie_line,
                                           net::CookieOptions* options) {
   return true;
 }
 
 bool ShellNetworkDelegate::OnCanAccessFile(const net::URLRequest& request,
                                            const FilePath& path) const {
   return true;
 }
 
+bool ShellNetworkDelegate::OnCanThrottleRequest(
+    const net::URLRequest& request) const {
+  return false;
+}
+
 }  // namespace content