Issue #1355 - Store the dirty rect on the display list builder rather than passing it as a parameter to BuildDisplayList

Also fix build bustage for De-unified layout/xul in nsRootBoxFrame.cpp

layout/forms/nsHTMLButtonControlFrame.cpp

@@ -98,7 +98,6 @@ nsHTMLButtonControlFrame::ShouldClipPaintingToBorderBox()
 
 void
 nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
-                                           const nsRect&           aDirtyRect,
                                            const nsDisplayListSet& aLists)
 {
   // Clip to our border area for event hit testing.
@@ -132,7 +131,7 @@ nsHTMLButtonControlFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
       clipState.ClipContainingBlockDescendants(rect, hasRadii ? radii : nullptr);
     }
 
-    BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), aDirtyRect, set,
+    BuildDisplayListForChild(aBuilder, mFrames.FirstChild(), set,
                              DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT);
     // That should put the display items in set.Content()
   }