Removed main-thread one dimensional scrolling paths.

third_party/WebKit/Source/core/layout/LayoutBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 750 matching lines @@
     }
 
     if (!isHorizontalWritingMode() && style()->overflowX() == OSCROLL) {
         // Even with OSCROLL, the scrollbar may not exist (crbug.com/415031).
         return scrollableArea()->hasHorizontalScrollbar() ? horizontalScrollbarHeight() : 0;
     }
 
     return 0;
 }
 
-ScrollResultOneDimensional LayoutBox::scroll(ScrollDirectionPhysical direction, ScrollGranularity granularity, float delta)
+ScrollResult LayoutBox::scroll(ScrollGranularity granularity, const FloatSize& delta)
 {
     // Presumably the same issue as in setScrollTop. See crbug.com/343132.
     DisableCompositingQueryAsserts disabler;
 
     if (!scrollableArea())
-        return ScrollResultOneDimensional(false);
+        return ScrollResult();
 
-    return scrollableArea()->userScroll(direction, granularity, delta);
+    return scrollableArea()->userScroll(granularity, delta);
 }
 
 bool LayoutBox::canBeScrolledAndHasScrollableArea() const
 {
     return canBeProgramaticallyScrolled() && (pixelSnappedScrollHeight() != pixelSnappedClientHeight() || pixelSnappedScrollWidth() != pixelSnappedClientWidth());
 }
 
 bool LayoutBox::canBeProgramaticallyScrolled() const
 {
     Node* node = this->node();
@@ skipping 3876 matching lines @@
 }
 
 void LayoutBox::IntrinsicSizingInfo::transpose()
 {
     size = size.transposedSize();
     aspectRatio = aspectRatio.transposedSize();
     std::swap(hasWidth, hasHeight);
 }
 
 } // namespace blink