Fix warning C4312 (x64) - reinterpret_cast conversion to greater size Change-Id: I90504b00e8f3af208511ec393ddfb0da267f56bc Reviewed-on: https://chromium-review.googlesource.com/293341 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Austin Kinross <aukinros@microsoft.com>