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Updates the check used for gating the availability of various commands
(CanCreateWebApp) to include a check for the current page being in an
error state, correctly reflecting the functionality of the code
associated with this check (CreateWebAppFromCurrentWebContents).
Currently the only user scenario this changes is the enabled state of
the "Creates shortcut" command, but this ensures that any other
commands leveraging the same functionality will be appropriately gated
as well. Other commands already using this check (such as the command
for installing a PWA) are already disabled in the error page state due
to additional restrictions.

Test: Navigate to an invalid page (e.g. "foo.bar") and invoke
More tools > Create shortcut.  Without this change, nothing will appear
to happen until navigating to a valid page, at which point the "Create
shortcut?" dialog will finally appear.  With this change the "Create
shortcut" menu option will be disabled until you navigate to a valid
page.

Bug: 1056709
Change-Id: I9cd15876ca9bc1443b776fe8ea326608cd8ea0ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063031
Commit-Queue: Hoch Hochkeppel <mhochk@microsoft.com>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745285}