Revert of Remove scoped styles.

Source/core/css/resolver/SharedStyleFinder.cpp

Index: Source/core/css/resolver/SharedStyleFinder.cpp
diff --git a/Source/core/css/resolver/SharedStyleFinder.cpp b/Source/core/css/resolver/SharedStyleFinder.cpp
index 7558ed508e4f98b86491643793402233352dc109..c0f96494e9ed8bebbd7fcadf44e859a8db571d87 100644
--- a/Source/core/css/resolver/SharedStyleFinder.cpp
+++ b/Source/core/css/resolver/SharedStyleFinder.cpp
@@ -226,6 +226,8 @@
         return false;
     if (candidate.hasID() && m_features.hasSelectorForId(candidate.idForStyleResolution()))
         return false;
+    if (candidate.hasScopedHTMLStyleChild())
+        return false;
     if (!sharingCandidateCanShareHostStyles(candidate))
         return false;
     if (!sharingCandidateDistributedToSameInsertionPoint(candidate))
@@ -253,6 +255,8 @@
 
     if (element().parentOrShadowHostElement() != parent) {
         if (!parent->isStyledElement())
+            return false;
+        if (parent->hasScopedHTMLStyleChild())
             return false;
         if (parent->inlineStyle())
             return false;