Remove another unused function after https://codereview.chromium.org/1581473002
Remove another unused function after https://codereview.chromium.org/1581473002

BUG=82385,558054
TBR=scottmg

Review URL: https://codereview.chromium.org/1583733004 .

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#369232}

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