Remove background obscuration checks.

sky/engine/platform/graphics/filters/FilterOperations.cpp

Index: sky/engine/platform/graphics/filters/FilterOperations.cpp
diff --git a/sky/engine/platform/graphics/filters/FilterOperations.cpp b/sky/engine/platform/graphics/filters/FilterOperations.cpp
index be17fa26e71e6eed81b352eded045614823bdc6d..e393c5bf0ebbaa6129d16b7e58d896df751ca754 100644
--- a/sky/engine/platform/graphics/filters/FilterOperations.cpp
+++ b/sky/engine/platform/graphics/filters/FilterOperations.cpp
@@ -155,14 +155,6 @@ FilterOutsets FilterOperations::outsets() const
     return totalOutsets;
 }
 
-bool FilterOperations::hasFilterThatAffectsOpacity() const
-{
-    for (size_t i = 0; i < m_operations.size(); ++i)
-        if (m_operations[i]->affectsOpacity())
-            return true;
-    return false;
-}
-
 bool FilterOperations::hasFilterThatMovesPixels() const
 {
     for (size_t i = 0; i < m_operations.size(); ++i)