Cleanup bitfield accessors for slimming paint v2

Source/core/layout/LayoutBlock.cpp

Index: Source/core/layout/LayoutBlock.cpp
diff --git a/Source/core/layout/LayoutBlock.cpp b/Source/core/layout/LayoutBlock.cpp
index 7780283ef6dc026e34960da4a8ebcc7a3249f6d8..b8625aa38868e2b01882d6037636f8e77616cbc7 100644
--- a/Source/core/layout/LayoutBlock.cpp
+++ b/Source/core/layout/LayoutBlock.cpp
@@ -2788,7 +2788,7 @@ static bool recalcNormalFlowChildOverflowIfNeeded(LayoutObject* layoutObject)
 bool LayoutBlock::recalcChildOverflowAfterStyleChange()
 {
     ASSERT(childNeedsOverflowRecalcAfterStyleChange());
-    setChildNeedsOverflowRecalcAfterStyleChange(false);
+    clearChildNeedsOverflowRecalcAfterStyleChange();
 
     bool childrenOverflowChanged = false;
 
@@ -2844,7 +2844,7 @@ bool LayoutBlock::recalcOverflowAfterStyleChange()
     if (!selfNeedsOverflowRecalcAfterStyleChange() && !childrenOverflowChanged)
         return false;
 
-    setSelfNeedsOverflowRecalcAfterStyleChange(false);
+    clearSelfNeedsOverflowRecalcAfterStyleChange();
     // If the current block needs layout, overflow will be recalculated during
     // layout time anyway. We can safely exit here.
     if (needsLayout())