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

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 178 matching lines @@
 }
 
 static ScrollableArea* scrollableAreaForNode(Node* node)
 {
     if (!node)
         return nullptr;
 
     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();
     if (!layoutObject || !layoutObject->isBox())
         return nullptr;
 
     return toLayoutBox(layoutObject)->scrollableArea();
 }
 
 const char* Internals::internalsId = "internals";
@@ skipping 2350 matching lines @@
 }
 
 int Internals::getScrollAnimationState(Node* node) const
 {
     if (ScrollableArea* scrollableArea = scrollableAreaForNode(node))
         return static_cast<int>(scrollableArea->scrollAnimator().m_runState);
     return -1;
 }
 
 } // namespace blink