Backed out changeset fdaa0659fe13 (bug 863324) because of build bustage on a CLOSED TREE

--HG--
rename : gfx/layers/ipc/PLayerTransaction.ipdl => gfx/layers/ipc/PLayers.ipdl
rename : gfx/layers/ipc/LayerTransactionChild.cpp => gfx/layers/ipc/ShadowLayersChild.cpp
rename : gfx/layers/ipc/LayerTransactionChild.h => gfx/layers/ipc/ShadowLayersChild.h
rename : gfx/layers/ipc/LayerTransactionParent.cpp => gfx/layers/ipc/ShadowLayersParent.cpp
rename : gfx/layers/ipc/LayerTransactionParent.h => gfx/layers/ipc/ShadowLayersParent.h