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This adds support for encoding the launch id for the context menu item,
in a similar way as for the button index (context menu click is treated
by the Action Center as a button click).

This also removes the check for native notifications being enabled
while processing the command line at startup. Main reason for that
is that the notification activator does not enable native notifications
when it passes the command line to Chrome, but native notifications
are already implied anyway (otherwise the notification activator wouldn't
be used). So, we can remove the check.

Bug: 734095
Change-Id: I629dabaab290fba9043114bf2403daba2b8b7f0c
Reviewed-on: https://chromium-review.googlesource.com/952446
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541800}