Bug 987290 - Allow using MFBT Typed Enums as bitwise flags - r=Waldo
Bug 987290 - Tweak AudioChannel enum conversions to please typed enums - r=ehsan
Bug 987290 - Follow-up: fix TestTypedEnum to avoid requiring behavior that relies on explicit conversions, when they are not available. Fixes the build on MSVC 2012 - no review, bustage fix