CSS Counters not properly updated on style changes

Source/core/layout/LayoutCounter.cpp

Index: Source/core/layout/LayoutCounter.cpp
diff --git a/Source/core/layout/LayoutCounter.cpp b/Source/core/layout/LayoutCounter.cpp
index 8ea4aa7e587c3e3a6d33d7fa6d934599b136f193..945101c3cf383e0ce05654aa41639239fb1cbfda 100644
--- a/Source/core/layout/LayoutCounter.cpp
+++ b/Source/core/layout/LayoutCounter.cpp
@@ -569,6 +569,8 @@ void LayoutCounter::layoutObjectStyleChanged(LayoutObject& layoutObject, const C
                 LayoutCounter::destroyCounterNodes(layoutObject);
         }
     } else if (newCounterDirectives) {
+        if (layoutObject.hasCounterNodeMap())
+            LayoutCounter::destroyCounterNodes(layoutObject);
         CounterDirectiveMap::const_iterator newMapEnd = newCounterDirectives->end();
         for (CounterDirectiveMap::const_iterator it = newCounterDirectives->begin(); it != newMapEnd; ++it) {
             // We must create this node here, because the added node may be a node with no display such as