libweave: Remove reference to libchromeos libchromeos is not used in libweave, so it should not be referenced from the library's makefile. BUG: 24872993 Change-Id: Ifd9a522d560d652e53fcc757769ae267b4e35eb1 Reviewed-on: https://weave-review.googlesource.com/1413 Reviewed-by: Vitaly Buka <vitalybuka@google.com>