Enable Clear-Site-Data by default.

content/browser/loader/resource_dispatcher_host_impl.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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 812 matching lines @@
 
   // Points to the registered download handler intercept.
   CreateDownloadHandlerIntercept create_download_handler_intercept_;
 
   // Task runner for the main thread.
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   // Task runner for the IO thead.
   scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
 
-  // Whether experimental web platform features are enabled.
-  bool experimental_web_features_enabled_;
-
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_