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Since we're wrapping up one experiment for CSD on Desktop (vision-based
CSD) and moving immediately into another (the new DOM-based model),
take this opportunity to remove the legacy usage of
GetVariationParamValue on Desktop.

Change-Id: Idc153248827e48fdd53d6b062fc32285644d3204
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551458Reviewed-by: Bettina Dea <bdea@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829828}