content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../device/battery/battery.gyp:device_battery',
     '../device/battery/battery.gyp:device_battery_mojo_bindings',
@@ skipping 907 matching lines @@
       'browser/loader/navigation_resource_handler.cc',
       'browser/loader/navigation_resource_handler.h',
       'browser/loader/navigation_url_loader.cc',
       'browser/loader/navigation_url_loader.h',
       'browser/loader/navigation_url_loader_delegate.h',
       'browser/loader/navigation_url_loader_factory.h',
       'browser/loader/navigation_url_loader_impl.cc',
       'browser/loader/navigation_url_loader_impl.h',
       'browser/loader/navigation_url_loader_impl_core.cc',
       'browser/loader/navigation_url_loader_impl_core.h',
+      'browser/loader/null_resource_handler.cc',
+      'browser/loader/null_resource_handler.h',
       'browser/loader/power_save_block_resource_throttle.cc',
       'browser/loader/power_save_block_resource_throttle.h',
       'browser/loader/redirect_to_file_resource_handler.cc',
       'browser/loader/redirect_to_file_resource_handler.h',
       'browser/loader/resource_buffer.cc',
       'browser/loader/resource_buffer.h',
       'browser/loader/resource_dispatcher_host_impl.cc',
       'browser/loader/resource_dispatcher_host_impl.h',
       'browser/loader/resource_handler.cc',
       'browser/loader/resource_handler.h',
@@ skipping 1116 matching lines @@
         'browser/media/media_web_contents_observer.h',
       ],
     }],
     ['OS == "linux" and use_openssl==1', {
       'dependencies': [
         '../third_party/boringssl/boringssl.gyp:boringssl',
       ],
     }],
   ],
 }