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the backing string was getting destroyed too early.

base: :FeatureList::SplitFeatureListString takes in a StringPiece, and
Change-Id: Id054a40451031bc41cbae3d4caa95f25568d0011
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887830Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710436}