Backout changeset e1bddda508fe for double logging when running mochitests through mach.
Bug 832091 - guards against crashes in resolveDOMCollectionProperty. r=bholley
Bug 859021 - Fix remaining MSVC build warnings and remove the MSVC exemption for FAIL_ON_WARNINGS in content/svg/content/src. r=dholbert
Bug 859021 - Add comments explaining "0 -". r=dholbert DONTBUILD