Make <webview> use out-of-process iframe architecture.

extensions/extensions.gypi

 # Copyright 2015 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': {
     'extensions_common_constants_sources': [
       'common/constants.cc',
       'common/constants.h',
     ],
@@ skipping 878 matching lines @@
       'renderer/extensions_render_frame_observer.cc',
       'renderer/extensions_render_frame_observer.h',
       'renderer/extensions_renderer_client.cc',
       'renderer/extensions_renderer_client.h',
       'renderer/file_system_natives.cc',
       'renderer/file_system_natives.h',
       'renderer/guest_view/extensions_guest_view_container_dispatcher.cc',
       'renderer/guest_view/extensions_guest_view_container_dispatcher.h',
       'renderer/guest_view/extensions_guest_view_container.cc',
       'renderer/guest_view/extensions_guest_view_container.h',
+      'renderer/guest_view/extensions_iframe_guest_view_container.cc',
+      'renderer/guest_view/extensions_iframe_guest_view_container.h',
+      'renderer/guest_view/extensions_iframe_guest_view_request.cc',
+      'renderer/guest_view/extensions_iframe_guest_view_request.h',
       'renderer/guest_view/guest_view_internal_custom_bindings.cc',
       'renderer/guest_view/guest_view_internal_custom_bindings.h',
       'renderer/guest_view/mime_handler_view/mime_handler_view_container.cc',
       'renderer/guest_view/mime_handler_view/mime_handler_view_container.h',
       'renderer/i18n_custom_bindings.cc',
       'renderer/i18n_custom_bindings.h',
       'renderer/id_generator_custom_bindings.cc',
       'renderer/id_generator_custom_bindings.h',
       'renderer/injection_host.cc',
       'renderer/injection_host.h',
@@ skipping 151 matching lines @@
       'test/result_catcher.h',
       'test/test_content_utility_client.cc',
       'test/test_content_utility_client.h',
       'test/test_extensions_client.cc',
       'test/test_extensions_client.h',
       'test/test_permission_message_provider.cc',
       'test/test_permission_message_provider.h',
     ],
   },
 }