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This CL updates AppBannerManager methods:
 - ShouldDeferToRelatedApplication => ShouldDeferToRelatedNonWebApp
 - IsSupportedAppPlatform => IsSupportedNonWebAppPlatform
 - IsRelatedAppInstalled => IsRelatedNonWebAppInstalled
to be more clear that they're checking for related non-web apps.

This distinction is important now that we have the chromeos_play
platform which is used to list web apps on the Play store.

Change-Id: I0014b4977078ee46a97b11777b442506b5b2d566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2483712
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818364}