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This CL change the context menu flag to add another options.
This allows to have the following options:
- The Web context menu
- The System context menu (but still using our implementation)

It will be decided later which implementation yields the best results.

Bug: 1140387
Change-Id: I92cf9fbb5be8214e295851a9293daba804b0e546
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584963
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841533}