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This change disables the menu item for creating page/PWA shortcuts while
in incognito mode. This makes desktop consistent with Android's behaviour.

The test added by this CL uncovered a feature list DCHECK hit when
calling GetPwaForSecureActiveTab(). This CL cleans up that minor bug
as well.

Bug: 829716
Change-Id: I5818a280724e65c8af5e0a0c6a1d24a0809c77bb
Reviewed-on: https://chromium-review.googlesource.com/1032273Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554696}