Bug 376223. Make frame construction for XUL listbox content grab pseudo frames if necessary. r+sr=bzbarsky

layout/base/nsCSSFrameConstructor.cpp

@@ -12219,7 +12219,10 @@ nsCSSFrameConstructor::CreateListBoxContent(nsPresContext* aPresContext,
                                 aParentFrame, aChild->Tag(),
                                 aChild->GetNameSpaceID(),
                                 styleContext, frameItems, PR_FALSE);
-    
+    if (!state.mPseudoFrames.IsEmpty()) {
+      ProcessPseudoFrames(state, frameItems); 
+    }
+
     nsIFrame* newFrame = frameItems.childList;
     *aNewFrame = newFrame;