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Migrating ui/webui/resources and chromeos/components/

preprocess_if_expr is identical to preprocess_grit for files not using
the deprecated // <include> in JS.

Also mark preprocess_grit as unsupported, since it will have only one
remaining user, which needs further evaluation (file_manager).

Change-Id: Ied707603cedbcc28af50ff8a262c2da758d0179e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2570814
Commit-Queue: dpapad <dpapad@chromium.org>
Auto-Submit: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833403}