The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/44fccdc3a9d6879d4cba838106cae466373475cc

commit 44fccdc3a9d6879d4cba838106cae466373475cc
Author: olivierrobin <olivierrobin@chromium.org>
Date: Wed Jan 18 09:52:44 2017

Clean the new CRWContextMenuController

- Switch to ARC
- Remove legacy code that detected system gesture recognizers on web
  views.
- Extract the NSDictionary -> ContextMenuParams logic and add unittests.

Note: egtests are already available in context_menu_egtests.

BUG= 680930 

Review-Url: https://codereview.chromium.org/2640433002
Cr-Commit-Position: refs/heads/master@{#444318}

[modify] https://crrev.com/44fccdc3a9d6879d4cba838106cae466373475cc/ios/web/BUILD.gn
[add] https://crrev.com/44fccdc3a9d6879d4cba838106cae466373475cc/ios/web/web_state/context_menu_params_utils.h
[add] https://crrev.com/44fccdc3a9d6879d4cba838106cae466373475cc/ios/web/web_state/context_menu_params_utils.mm
[add] https://crrev.com/44fccdc3a9d6879d4cba838106cae466373475cc/ios/web/web_state/context_menu_params_utils_unittest.mm
[modify] https://crrev.com/44fccdc3a9d6879d4cba838106cae466373475cc/ios/web/web_state/ui/crw_context_menu_controller.mm