Replace various ScrollableArea scroll methods with setScrollPosition

Source/core/page/SpatialNavigation.cpp

Index: Source/core/page/SpatialNavigation.cpp
diff --git a/Source/core/page/SpatialNavigation.cpp b/Source/core/page/SpatialNavigation.cpp
index 1487bbe1c23863daafc9003fc3e0e48bb26b87de..23b80c4071d799e9124ee75b291f7df8ac066978 100644
--- a/Source/core/page/SpatialNavigation.cpp
+++ b/Source/core/page/SpatialNavigation.cpp
@@ -215,7 +215,7 @@ bool scrollInDirection(LocalFrame* frame, WebFocusType type)
             return false;
         }
 
-        frame->view()->scrollBy(IntSize(dx, dy));
+        frame->view()->scrollBy(IntSize(dx, dy), UserScroll);
         return true;
     }
     return false;