Remove viewportDefiningElement.

sky/engine/core/rendering/RenderBox.cpp

Index: sky/engine/core/rendering/RenderBox.cpp
diff --git a/sky/engine/core/rendering/RenderBox.cpp b/sky/engine/core/rendering/RenderBox.cpp
index 0cd73ebb5023e176261b0efd7611bc6e6cdf7cd7..4c803e874a12a4771ff22c519479e2703c9ad406 100644
--- a/sky/engine/core/rendering/RenderBox.cpp
+++ b/sky/engine/core/rendering/RenderBox.cpp
@@ -128,14 +128,10 @@ void RenderBox::updateFromStyle()
     if (isRootObject || isViewObject)
         setHasBoxDecorationBackground(true);
 
-    bool boxHasOverflowClip = false;
-    if (!styleToUse->isOverflowVisible() && isRenderBlock() && !isViewObject) {
-        // If overflow has been propagated to the viewport, it has no effect here.
-        if (node() != document().viewportDefiningElement())
-            boxHasOverflowClip = true;
-    }
+    // TODO(esprehn): Why do we not want to set this on the RenderView?
+    if (isRenderBlock() && !isViewObject)
+        setHasOverflowClip(!styleToUse->isOverflowVisible());
 
-    setHasOverflowClip(boxHasOverflowClip);
     setHasTransform(styleToUse->hasTransformRelatedProperty());
 }