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This CL removes the 'Open as tab/window' and 'App Info' options for
System PWAs in the App Launcher and Shelf.

Bug: 836128
Change-Id: I80dd5046d49e709c766a893d581298eb176e4bdc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1557478Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649771}