Remove dead StyleDifference::needsRecompositeLayer

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index 43fedd29bc3bc2361fad3db8cb6022937664b6d5..fdd09f644f89792b287ab94b0a37c93685f0e6ac 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -402,9 +402,6 @@ StyleDifference RenderStyle::visualInvalidationDiff(const RenderStyle& other, un
 
     changedContextSensitiveProperties = computeChangedContextSensitiveProperties(other, diff);
 
-    if (diff.hasNoChange() && diffNeedsRecompositeLayer(other))
-        diff.setNeedsRecompositeLayer();
-
     // Cursors are not checked, since they will be set appropriately in response to mouse events,
     // so they don't need to cause any repaint or layout.
 
@@ -667,21 +664,6 @@ bool RenderStyle::diffNeedsRepaintObject(const RenderStyle& other) const
     return false;
 }
 
-bool RenderStyle::diffNeedsRecompositeLayer(const RenderStyle& other) const
-{
-    if (rareNonInheritedData.get() != other.rareNonInheritedData.get()) {
-        if (rareNonInheritedData->m_transformStyle3D != other.rareNonInheritedData->m_transformStyle3D
-            || rareNonInheritedData->m_backfaceVisibility != other.rareNonInheritedData->m_backfaceVisibility
-            || rareNonInheritedData->m_perspective != other.rareNonInheritedData->m_perspective
-            || rareNonInheritedData->m_perspectiveOriginX != other.rareNonInheritedData->m_perspectiveOriginX
-            || rareNonInheritedData->m_perspectiveOriginY != other.rareNonInheritedData->m_perspectiveOriginY
-            || hasWillChangeCompositingHint() != other.hasWillChangeCompositingHint())
-            return true;
-    }
-
-    return false;
-}
-
 unsigned RenderStyle::computeChangedContextSensitiveProperties(const RenderStyle& other, StyleDifference diff) const
 {
     unsigned changedContextSensitiveProperties = ContextSensitivePropertyNone;