Remove CascadeScope, it's dead.

Source/core/css/resolver/StyleResolver.cpp

Index: Source/core/css/resolver/StyleResolver.cpp
diff --git a/Source/core/css/resolver/StyleResolver.cpp b/Source/core/css/resolver/StyleResolver.cpp
index e34c6a0c7b521208b2f6718a1bb996166becd4c8..c0b25bc224e07f37ff483272525e77c73c8f1746 100644
--- a/Source/core/css/resolver/StyleResolver.cpp
+++ b/Source/core/css/resolver/StyleResolver.cpp
@@ -389,11 +389,11 @@ void StyleResolver::matchAuthorRules(Element* element, ElementRuleCollector& col
     WillBeHeapVector<RawPtrWillBeMember<ScopedStyleResolver>, 8> resolversInShadowTree;
     collectScopedResolversForHostedShadowTrees(element, resolversInShadowTree);
     for (int j = resolversInShadowTree.size() - 1; j >= 0; --j)
-        resolversInShadowTree[j]->collectMatchingAuthorRules(collector, includeEmptyRules, ignoreCascadeScope, ++cascadeOrder);
+        resolversInShadowTree[j]->collectMatchingAuthorRules(collector, includeEmptyRules, ++cascadeOrder);
 
     // Match rules in your own scope (ShadowRoot or Document).
     if (ScopedStyleResolver* resolver = element->treeScope().scopedStyleResolver())
-        resolver->collectMatchingAuthorRules(collector, includeEmptyRules, ignoreCascadeScope, ++cascadeOrder);
+        resolver->collectMatchingAuthorRules(collector, includeEmptyRules, ++cascadeOrder);
 
     // Match /deep/, ::shadow and ::content rules.
     m_treeBoundaryCrossingRules.collectTreeBoundaryCrossingRules(element, collector, includeEmptyRules);