Fix internals method to return Layout Viewport scrollable area for FrameView.

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index d60efc75f62a6723d0f493729e2dd536d5024b6d..f36130bbf92e8902c9093ae8cf9572d27717fe7c 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -196,7 +196,7 @@ static ScrollableArea* scrollableAreaForNode(Node* node)
     if (node->isDocumentNode()) {
         // This can be removed after root layer scrolling is enabled.
         if (FrameView* frameView = toDocument(node)->view())
-            return frameView->scrollableArea();
+            return frameView->layoutViewportScrollableArea();
     }
 
     LayoutObject* layoutObject = node->layoutObject();