[Layout API] Use ownerLayoutItem() in scrollableAreaBoundingBox()

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index e106030ac6c138d8d707a6158cfcc99057eddaee..57b90d70007003b91be12c5f726b27289a921a4c 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2303,11 +2303,11 @@ void FrameView::scrollbarVisibilityChanged()
 
 IntRect FrameView::scrollableAreaBoundingBox() const
 {
-    LayoutPart* ownerLayoutObject = frame().ownerLayoutObject();
-    if (!ownerLayoutObject)
+    LayoutPartItem ownerLayoutItem = frame().ownerLayoutItem();
+    if (ownerLayoutItem.isNull())
         return frameRect();
 
-    return ownerLayoutObject->absoluteContentQuad().enclosingBoundingBox();
+    return ownerLayoutItem.absoluteContentQuad().enclosingBoundingBox();
 }