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On Mac, this was replaced by the email share service in the share menu.
It doesn't appear to have ever been hooked up on other platforms.

Bug: 1098822
Change-Id: Ibb3c30c0c32d98e7c46f04e80e01c05e145b5ea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264583Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782676}