Bug 1022612. Part 9: nsDisplayScrollInfoLayer destructor does not need to destroy ScrollLayerCount. r=mattwoodrow

Getting the timing of this right without processing display items in reverse
order is hard. But it doesn't matter if this property sticks around anyway.

--HG--
extra : rebase_source : 52cf25ce39a6ab38f89e0231ea044fdf3cac0a2d

layout/base/nsDisplayList.cpp

@@ -4122,8 +4122,6 @@ nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
 
 nsDisplayScrollInfoLayer::~nsDisplayScrollInfoLayer()
 {
-  FrameProperties props = mScrolledFrame->Properties();
-  props.Remove(nsIFrame::ScrollLayerCount());
   MOZ_COUNT_DTOR(nsDisplayScrollInfoLayer);
 }