Remove dead code related to compositing from Sky

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

Index: sky/engine/core/rendering/style/StyleRareNonInheritedData.cpp
diff --git a/sky/engine/core/rendering/style/StyleRareNonInheritedData.cpp b/sky/engine/core/rendering/style/StyleRareNonInheritedData.cpp
index d06140b2169904c6b1e5a1a24c8eef9a91a5ed6d..9bad4e8fb83830e8ecc5593f6ab2906b316859d7 100644
--- a/sky/engine/core/rendering/style/StyleRareNonInheritedData.cpp
+++ b/sky/engine/core/rendering/style/StyleRareNonInheritedData.cpp
@@ -66,7 +66,6 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
     , m_justifySelf(RenderStyle::initialJustifySelf())
     , m_justifySelfOverflowAlignment(RenderStyle::initialJustifySelfOverflowAlignment())
     , m_scrollBehavior(RenderStyle::initialScrollBehavior())
-    , m_requiresAcceleratedCompositingForExternalReasons(false)
 {
     m_maskBoxImage.setMaskDefaults();
 }
@@ -117,7 +116,6 @@ StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonInherited
     , m_justifySelf(o.m_justifySelf)
     , m_justifySelfOverflowAlignment(o.m_justifySelfOverflowAlignment)
     , m_scrollBehavior(o.m_scrollBehavior)
-    , m_requiresAcceleratedCompositingForExternalReasons(o.m_requiresAcceleratedCompositingForExternalReasons)
 {
 }
 
@@ -170,8 +168,7 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
         && m_justifyItemsPositionType == o.m_justifyItemsPositionType
         && m_justifySelf == o.m_justifySelf
         && m_justifySelfOverflowAlignment == o.m_justifySelfOverflowAlignment
-        && m_scrollBehavior == o.m_scrollBehavior
-        && m_requiresAcceleratedCompositingForExternalReasons == o.m_requiresAcceleratedCompositingForExternalReasons;
+        && m_scrollBehavior == o.m_scrollBehavior;
 }
 
 bool StyleRareNonInheritedData::counterDataEquivalent(const StyleRareNonInheritedData& o) const