Remove IDC_CREATE_SHORTCUT and its associated UI.

IDC_CREATE_SHORTCUT allows a user to create a hosted app from an
arbitrary web page. It was never implemented for Mac. On other
platforms, it has beed replaced by "Add to {Desktop, Homescreen,
Applications}". That is, BookmarkAppConfirmationView is now used instead
of CreateUrlApplicationShortcutView.

And although it may appear that IDC_CREATE_SHORTCUTS is an "enabled"
command, there's actually no way to invoke that command on any platform
because app_menu_model.cc will always add IDC_CREATE_HOSTED_APP instead.
(One exception: the x11 menubar on Desktop Linux had an entry, but
that's accidental).

BUG=702551

Review-Url: https://codereview.chromium.org/2772713002
Cr-Commit-Position: refs/heads/master@{#462322}
19 files changed