CHROMIUM: R59 branch only: fix missing declaration from bad merge

I don't really know why this was missing, but let's just fix it.
Next time I'll be more careful about what I promise.

BUG=none
TEST=none

Change-Id: I0b45afc02e4d2c6cfa7c5c26f90f9ff6638e8dda
Reviewed-on: https://chromium-review.googlesource.com/557965
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Tested-by: Luigi Semenzato <semenzato@chromium.org>
1 file changed