Removed main-thread one dimensional scrolling paths.

third_party/WebKit/Source/core/frame/RootFrameViewport.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef RootFrameViewport_h
 #define RootFrameViewport_h
 
 #include "core/CoreExport.h"
 #include "platform/scroll/ScrollableArea.h"
 
@@ skipping 45 matching lines @@
     IntSize contentsSize() const override;
     bool scrollbarsCanBeActive() const override;
     IntRect scrollableAreaBoundingBox() const override;
     bool userInputScrollable(ScrollbarOrientation) const override;
     bool shouldPlaceVerticalScrollbarOnLeft() const override;
     void scrollControlWasSetNeedsPaintInvalidation() override;
     GraphicsLayer* layerForContainer() const override;
     GraphicsLayer* layerForScrolling() const override;
     GraphicsLayer* layerForHorizontalScrollbar() const override;
     GraphicsLayer* layerForVerticalScrollbar() const override;
-    ScrollResultOneDimensional userScroll(ScrollDirectionPhysical, ScrollGranularity, float delta = 1) override;
+    ScrollResult userScroll(ScrollGranularity, const FloatSize&) override;
     bool scrollAnimatorEnabled() const override;
     HostWindow* hostWindow() const override;
     void serviceScrollAnimations(double) override;
     void updateCompositorScrollAnimations() override;
     void cancelProgrammaticScrollAnimation() override;
     ScrollBehavior scrollBehaviorStyle() const override;
     Widget* widget() override;
 
 private:
     RootFrameViewport(ScrollableArea& visualViewport, ScrollableArea& layoutViewport);
@@ skipping 10 matching lines @@
     ScrollableArea& visualViewport() const { ASSERT(m_visualViewport); return *m_visualViewport; }
     ScrollableArea& layoutViewport() const { ASSERT(m_layoutViewport); return *m_layoutViewport; }
 
     RawPtrWillBeMember<ScrollableArea> m_visualViewport;
     RawPtrWillBeMember<ScrollableArea> m_layoutViewport;
 };
 
 } // namespace blink
 
 #endif // RootFrameViewport_h