Fix lfiespan of ScopedStyleResolver

Source/core/dom/shadow/ShadowRoot.cpp

Index: Source/core/dom/shadow/ShadowRoot.cpp
diff --git a/Source/core/dom/shadow/ShadowRoot.cpp b/Source/core/dom/shadow/ShadowRoot.cpp
index d346a20aa456d01395b2979695a07ddf88d4cb23..755c769d469a056bd75c90c94de6f09f2bd61ef5 100644
--- a/Source/core/dom/shadow/ShadowRoot.cpp
+++ b/Source/core/dom/shadow/ShadowRoot.cpp
@@ -175,13 +175,18 @@ Node::InsertionNotificationRequest ShadowRoot::insertedInto(ContainerNode* inser
 
 void ShadowRoot::removedFrom(ContainerNode* insertionPoint)
 {
-    if (insertionPoint->inDocument() && m_registeredWithParentShadowRoot) {
-        ShadowRoot* root = host()->containingShadowRoot();
-        if (!root)
-            root = insertionPoint->containingShadowRoot();
-        if (root)
-            root->removeChildShadowRoot();
-        m_registeredWithParentShadowRoot = false;
+    if (insertionPoint->inDocument()) {
+        if (ScopedStyleResolver* resolver = scopedStyleResolver())
+            insertionPoint->document().styleEngine()->removeScopedStyleResolver(resolver);
+
+        if (m_registeredWithParentShadowRoot) {
+            ShadowRoot* root = host()->containingShadowRoot();
+            if (!root)
+                root = insertionPoint->containingShadowRoot();
+            if (root)
+                root->removeChildShadowRoot();
+            m_registeredWithParentShadowRoot = false;
+        }
     }
 
     DocumentFragment::removedFrom(insertionPoint);