Remove --build_root from all scripts.

BUG=chromium-os:27364
TEST=Remote trybot run. git grep for references to build_root.
CQ-DEPEND=I502f7df0123a598fc62a4ef4ed847ceb182f65b8

Change-Id: Ice8fbdde3665a406722c2315c6404c4351b8fd00
Reviewed-on: https://gerrit.chromium.org/gerrit/18284
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: David James <davidjames@chromium.org>
Tested-by: David James <davidjames@chromium.org>
2 files changed