This patch:
- adds fails-if annotations for all the reftests that were consistently failing
  with layers-free turned on.
- removes fails-if or reduces the range on fuzzy-if annotations for all
  the reftests that were producing UNEXPECTED-PASS results with
  layers-free turned on.
- adds skip-if, random-if, or fuzzy-if annotations to the reftests that
  were intermittently failing due to timeout, obvious incorrectness, or
  slight pixel differences, respectively.

MozReview-Commit-ID: A0Aknn6rnjj

--HG--
extra : rebase_source : 420d9cf43f23a5d654fa36eec69138937d13c173