Backout 7aceff7124d9 (bug 815591) for Mac test failures

layout/base/nsDisplayList.cpp

@@ -1565,13 +1565,11 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
                                                drawBackgroundImage, drawBackgroundColor);
   }
 
-  // Even if we don't actually have a background color to paint, we may still need
-  // to create an item for hit testing.
-  if (color != NS_RGBA(0,0,0,0) || aBuilder->IsForEventDelivery()) {
-    aList->AppendNewToTop(
-        new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bg,
-                                                drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0)));
-  }
+  // Even if we don't actually have a background color to paint, we still need
+  // to create the item because it's used for hit testing.
+  aList->AppendNewToTop(
+      new (aBuilder) nsDisplayBackgroundColor(aBuilder, aFrame, bg,
+                                              drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0)));
  
   // Passing bg == nullptr in this macro will result in one iteration with
   // i = 0.