Allow more room for factory shim rootfs
Allow more room for factory shim rootfs

For reasons yet to be determined the factory shim rootfs size spills
over allotted 300 MBytes. The actual culprit will have to be
determined and hopefully eliminated, at the time the lower size could
be restored by reverting this change.

BUG=chromium-os:34167
TEST=manual

   ./build_image --board=amd64-generic factory_install
    was failing before this change and is succeeding now

Change-Id: I01456f8317b0d02968068f609811c36d4816f353
Reviewed-on: https://gerrit.chromium.org/gerrit/32298
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Reviewed-by: Jon Salz <02f606d7fe027b93db0ccb8283f0d43a8932fe7a@chromium.org>
Tested-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Commit-Ready: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-by: Peter Mayo <3d31fdaf44dc55bb1b4f50b19df9bc879177d37a@chromium.org>

glevand/coreos--scripts,gtank/scripts,vmware/coreos-scripts,zhang0137/scripts,BugRoger/scripts,trnubo/scripts,mischief/scripts,sigma/coreos-scripts,andrejro/coreos--scripts,marineam/coreos-scripts,glevand/coreos--scripts,fivethreeo/scripts,mischief/scripts,mischief/scripts,zhang0137/scripts,sigma/coreos-scripts,mjg59/scripts,coreos/scripts,crawford/scripts,fivethreeo/scripts,smilart/scripts,coreos/scripts,mjg59/scripts,BugRoger/scripts,bcwaldon/coreos-scripts,crawford/scripts,trnubo/scripts,bcwaldon/coreos-scripts,smilart/scripts,vmware/coreos-scripts,gtank/scripts,smilart/scripts,andrejro/coreos--scripts,fivethreeo/scripts,zhang0137/scripts,endocode/scripts,trnubo/scripts,BugRoger/scripts,nicescale/scripts,andrejro/coreos--scripts,gtank/scripts,marineam/coreos-scripts,sigma/coreos-scripts,crawford/scripts,endocode/scripts,nicescale/scripts,mjg59/scripts,marineam/coreos-scripts,vmware/coreos-scripts,endocode/scripts,nicescale/scripts,bcwaldon/coreos-scripts