Revert of Avoid unnecessary descents into nested boxes with floats.

Source/core/rendering/RenderBlockFlow.cpp

Index: Source/core/rendering/RenderBlockFlow.cpp
diff --git a/Source/core/rendering/RenderBlockFlow.cpp b/Source/core/rendering/RenderBlockFlow.cpp
index 0ba9db53f96bedf52594e9b82265d1789dc50d87..1e5e7fd046b940073b8555b2fc13061822a561cd 100644
--- a/Source/core/rendering/RenderBlockFlow.cpp
+++ b/Source/core/rendering/RenderBlockFlow.cpp
@@ -446,7 +446,6 @@
     // Add overflow from children (unless we're multi-column, since in that case all our child overflow is clipped anyway).
     computeOverflow(oldClientAfterEdge);
 
-    m_descendantsWithFloatsMarkedForLayout = false;
     return true;
 }
 
@@ -1692,10 +1691,6 @@
     if (!everHadLayout() && !containsFloats())
         return;
 
-    if (m_descendantsWithFloatsMarkedForLayout)
-        return;
-    m_descendantsWithFloatsMarkedForLayout = true;
-
     MarkingBehavior markParents = inLayout ? MarkOnlyThis : MarkContainingBlockChain;
     setChildNeedsLayout(markParents);