Change to use new location of shflags BUG=chromium-os:21742 TEST=manual verify this works with new dev-utils/shflags package Change-Id: Ieaa4fefb02353923d3197b2ef221e42d530d71cd Reviewed-on: https://gerrit.chromium.org/gerrit/10376 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Mike Frysinger <vapier@chromium.org> Tested-by: Sonny Rao <sonnyrao@chromium.org>