Backed out 5fa1f7715c19:7a300d1d1b23 (bug 855130) for Windows build failures
CLOSED TREE
Backed out changeset 77bd60758c53 (bug 879565) for still asserting, just not quite as much
Bug 876064 - Change HeapLabel with NonAssertingLabel, and don't allocate it on the heap. r=luke
Bug 876064 - Implement constant pools for double constants on x64. r=sstangl
Bug 843236 Use widget::KeyboardLayout and widget::NativeKey for handling key messages on Metrofox r=tabraldes