Remove the requirement that we have a sticky ebuild when not revving the sticky chrome branch

BUG=chromium-os:20334
TEST=unittests + cros_mark_chrome w/ latest_release and stable_release

Change-Id: I73756b5e003b251e1e7138673ae6a01ec60f8e34
Reviewed-on: https://gerrit.chromium.org/gerrit/16862
Commit-Ready: Chris Sosa <sosa@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Chris Sosa <sosa@chromium.org>
(cherry picked from commit 9ba477583747125475732a980d4a11a9fbd702fd)
Reviewed-on: https://gerrit.chromium.org/gerrit/37842
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: David James <davidjames@chromium.org>
4 files changed