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Updates ntp_tiles_internals_ui.cc and history_ui.cc  for compatibility
with ephemeral Guest profiles.

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

Bug: 1125474
Change-Id: Ib538a3df1d3c547817f57473bd1d3cce85df0299
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461337Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816072}