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Small cleanup: use the IsOptimizationHintsEnabled helper function consistently rather than accessing the kOptimizationHints feature directly.

Change-Id: Ie61c5ba532e71c9524369f5d1bb056e8303ac02f
Reviewed-on: https://chromium-review.googlesource.com/1119229Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Jeremy Elson <jelson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571517}