Update UserTypeFilter for ephemeral Guest profiles.

User type filter is updated to return correct type for ephemeral Guest
profiles.

This change is behind disabled |EnableEphemeralGuestProfilesOnDesktop|
flag.
Please see go/ephemeral-guest-profiles for more context.

Bug: 1125474
Change-Id: Id5743e7d22cb9a1043e64ae7b6a696f41d0724d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2470656Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819744}

chrome/browser/apps/user_type_filter.cc

@@ -24,7 +24,7 @@ const char kUserTypeUnmanaged[] = "unmanaged";
 std::string DetermineUserType(Profile* profile) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(!profile->IsOffTheRecord());
-  if (profile->IsGuestSession())
+  if (profile->IsGuestSession() || profile->IsEphemeralGuestProfile())
     return kUserTypeGuest;
   if (profile->IsChild())
     return kUserTypeChild;