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This CL makes the DecidePermission check if it is possible to get a
InstalledWebappGeolocationContext instead of checking the
InstalledWebappBridge::ShouldDelegateLocationPermission

GetInstalledWebappGeolocationContext() returns nullptr when either not
running in TWA mode or should not delegate geolocation to it.
It's mostly the same logic as the one in InstalledWebappBridge,
except checking the current customtabsactivity instead of the
LastTrackedFocusedTwaCustomTabActivity. so it's better using this one.

Bug: 1106391
Change-Id: If66b10b44d71d30358088c00245c315be5c15829
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2303049Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789393}