Fix reinterpret_cast size missmatch warning on 64-bit Windows. Change-Id: I9c4b102c60abb90281f778833be9b1d5bfdcb8f1 Reviewed-on: https://chromium-review.googlesource.com/786110 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>