In miBoxesToRegion() need to reset extents to 0..0 to ensure miValidateRegion() computes new extents properly.
In miBoxesToRegion() need to reset extents to 0..0 to ensure miValidateRegion()
computes new extents properly.

rpavlik/chromium,rpavlik/chromium,rpavlik/chromium,rpavlik/chromium,rpavlik/chromium