Remove more scrolling code from Sky

sky/engine/core/rendering/style/StyleRareNonInheritedData.h

Index: sky/engine/core/rendering/style/StyleRareNonInheritedData.h
diff --git a/sky/engine/core/rendering/style/StyleRareNonInheritedData.h b/sky/engine/core/rendering/style/StyleRareNonInheritedData.h
index c6eae11f546814c274fee2247cea8141bb7febc2..345acccd34df3c0c43045037b261945737cfd5f2 100644
--- a/sky/engine/core/rendering/style/StyleRareNonInheritedData.h
+++ b/sky/engine/core/rendering/style/StyleRareNonInheritedData.h
@@ -148,10 +148,6 @@ public:
     unsigned m_justifySelf : 4; // ItemPosition
     unsigned m_justifySelfOverflowAlignment : 2; // OverflowAlignment
 
-    // ScrollBehavior. 'scroll-behavior' has 2 accepted values, but ScrollBehavior has a third
-    // value (that can only be specified using CSSOM scroll APIs) so 2 bits are needed.
-    unsigned m_scrollBehavior: 2;
-
     // Plugins require accelerated compositing for reasons external to blink.
     // In which case, we need to update the RenderStyle on the RenderEmbeddedObject,
     // so store this bit so that the style actually changes when the plugin