Introduce AncestorThrottle, which will process 'X-Frame-Options' headers.

content/content_tests.gypi

 # Copyright (c) 2013 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.
 
 {
   'variables': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 438 matching lines @@
       'browser/fileapi/sandbox_database_test_helper.h',
       'browser/fileapi/sandbox_directory_database_unittest.cc',
       'browser/fileapi/sandbox_file_system_backend_delegate_unittest.cc',
       'browser/fileapi/sandbox_file_system_backend_unittest.cc',
       'browser/fileapi/sandbox_isolated_origin_database_unittest.cc',
       'browser/fileapi/sandbox_origin_database_unittest.cc',
       'browser/fileapi/sandbox_prioritized_origin_database_unittest.cc',
       'browser/fileapi/timed_task_helper_unittest.cc',
       'browser/fileapi/transient_file_util_unittest.cc',
       'browser/fileapi/upload_file_system_file_element_reader_unittest.cc',
+      'browser/frame_host/ancestor_throttle_unittest.cc',
       'browser/frame_host/frame_tree_unittest.cc',
       'browser/frame_host/navigation_controller_impl_unittest.cc',
       'browser/frame_host/navigation_entry_impl_unittest.cc',
       'browser/frame_host/navigation_handle_impl_unittest.cc',
       'browser/frame_host/navigator_impl_unittest.cc',
       'browser/frame_host/render_frame_host_manager_unittest.cc',
       'browser/frame_host/render_widget_host_view_child_frame_unittest.cc',
       'browser/frame_host/render_widget_host_view_guest_unittest.cc',
       'browser/gamepad/gamepad_provider_unittest.cc',
       'browser/gamepad/gamepad_service_unittest.cc',
@@ skipping 1444 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }