The following DCHECK in RenderWidget::Resize() may fail after clearing the DeviceMetricsOverride:

DCHECK(!params.needs_resize_ack || !next_paint_is_resize_ack());

This is because the original ResizeParams are restored when the override is cleared, and those params may have needs_resize_ack set, even if there is already another resize in fly. Can be fixed by clearing the needs_resize_ack flag before restoring the params.