Remove isolatesBlending from render tree dumps

Source/core/rendering/RenderTreeAsText.cpp

Index: Source/core/rendering/RenderTreeAsText.cpp
diff --git a/Source/core/rendering/RenderTreeAsText.cpp b/Source/core/rendering/RenderTreeAsText.cpp
index d7841be752879459fcd77dd06ef875d3b915a434..9e3922e9455e1374aebb7c8929afeead883d6aaf 100644
--- a/Source/core/rendering/RenderTreeAsText.cpp
+++ b/Source/core/rendering/RenderTreeAsText.cpp
@@ -550,8 +550,6 @@ static void write(TextStream& ts, RenderLayer& l,
     else if (paintPhase == LayerPaintPhaseForeground)
         ts << " layerType: foreground only";
 
-    if (l.blendInfo().childLayerHasBlendMode())
-        ts << " isolatesBlending";
     if (l.blendInfo().hasBlendMode())
         ts << " blendMode: " << compositeOperatorName(CompositeSourceOver, l.blendInfo().blendMode());