Fix clang/win build after https://codereview.chromium.org/1284053004/

The change removed a function, but not its declaration, angering
-Wunused-function.

BUG=345845,82385
TBR=charliea

Review URL: https://codereview.chromium.org/1312313002 .

Cr-Commit-Position: refs/heads/master@{#345460}
1 file changed