Disable menu button for disabled extensions

This removes the confusing behavior where a user clicks a button,
expecting an action to happen, but there is no associated action so we
would instead spawn a context menu.

This now does not look like a clickable button (no hover state) and the
three-dot menu is used to access the context menu for extensions without
actions.

Bug: chromium:943702
Change-Id: I9ae6fe7d549dd2dac2d003fb6f1fecdab66e9c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575859
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652618}
2 files changed