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When Chrome uses the non-standard NewWindow action, there is a
duplicated entry in GNOME shell: one is the shell's built-in new
window action, and the other is Chrome's.

Using new-window instead solves this issue.

Also, change NewPrivateWindow to use new-private-window as well, since
this is what firefox does.

BUG=783963
R=thestig@chromium.org

Change-Id: I9747a402358089bfa297cf32f29c50c2a1f53035
Reviewed-on: https://chromium-review.googlesource.com/764557Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516101}