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This CL removes the 'Open as window' checkbox from the bookmark app
dialog when DesktopPWAWindowing is enabled and chooses to open as a
window if the site is an installable PWA and as a tab otherwise.

This requires adding an InstallableManager to the BookmarkAppHelper to
determine if the site is an installable PWA.

Bug: 729922
Change-Id: I30d6329d52a9fabe314e6a8b76aa46e209cd171f
Reviewed-on: https://chromium-review.googlesource.com/700137Reviewed-by: Ben Wells <benwells@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512761}