Remove unused function getInterpolationString
Remove unused function getInterpolationString

BUG=

Change-Id: I4135f4ae939043efa8ccab65ef1a5eb441370828
Reviewed-on: https://chromium-review.googlesource.com/401673
Reviewed-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Commit-Queue: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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