Make content shell support some testing flags.

content/shell/shell_url_request_context_getter.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_URL_REQUEST_CONTEXT_GETTER_H_
 #define CONTENT_SHELL_SHELL_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/url_request/url_request_context_getter.h"
 
 class MessageLoop;
 
 namespace net {
 class HostResolver;
+class MappedHostResolver;
 class NetworkDelegate;
 class ProxyConfigService;
 class URLRequestContextStorage;
 }
 
 namespace content {
 
 class ShellURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   ShellURLRequestContextGetter(
@@ skipping 15 matching lines @@
  private:
   bool ignore_certificate_errors_;
   FilePath base_path_;
   MessageLoop* io_loop_;
   MessageLoop* file_loop_;
 
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<net::NetworkDelegate> network_delegate_;
   scoped_ptr<net::URLRequestContextStorage> storage_;
   scoped_ptr<net::URLRequestContext> url_request_context_;
+  scoped_ptr<net::MappedHostResolver> mapped_host_resolver_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellURLRequestContextGetter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_URL_REQUEST_CONTEXT_GETTER_H_