Remove CSSCompositing

sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp

Index: sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp
diff --git a/sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp b/sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp
index e9ab7f0e4fdffe28ad5c204e8ef5c714b52f7175..d3d571348c2c66068690df3d5063dc2516f4827e 100644
--- a/sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp
+++ b/sky/engine/core/rendering/compositing/CompositingReasonFinder.cpp
@@ -80,7 +80,7 @@ CompositingReasons CompositingReasonFinder::potentialCompositingReasonsFromStyle
         reasons |= CompositingReasonPerspectiveWith3DDescendants;
 
     // If the implementation of createsGroup changes, we need to be aware of that in this part of code.
-    ASSERT((renderer->isTransparent() || renderer->hasMask() || renderer->hasFilter() || renderer->hasBlendMode()) == renderer->createsGroup());
+    ASSERT((renderer->isTransparent() || renderer->hasMask() || renderer->hasFilter()) == renderer->createsGroup());
 
     if (style->hasMask())
         reasons |= CompositingReasonMaskWithCompositedDescendants;
@@ -95,9 +95,6 @@ CompositingReasons CompositingReasonFinder::potentialCompositingReasonsFromStyle
     if (renderer->isTransparent())
         reasons |= CompositingReasonOpacityWithCompositedDescendants;
 
-    if (renderer->hasBlendMode())
-        reasons |= CompositingReasonBlendingWithCompositedDescendants;
-
     ASSERT(!(reasons & ~CompositingReasonComboAllStyleDeterminedReasons));
     return reasons;
 }