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Fix spelling mistake. The constant is called FILTERABLE_DATA_TYPES and not
FILTERABLE_DATATYPES.

Tbr: jochen@chromium.org

Change-Id: Id01c1081169aadc7544d1bd2beaf5050bdb26cf1
Reviewed-on: https://chromium-review.googlesource.com/1142782Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576449}