ScopedStyleResolver should be cleared when ShadowRoot is removed from document.

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 23674072ddfd184b8478d2c43e28ccc187f9b7d1..ab6dda319fb21d4ceabaae6e1641ef33151d5444 100644
--- a/Source/core/dom/shadow/ShadowRoot.cpp
+++ b/Source/core/dom/shadow/ShadowRoot.cpp
@@ -175,13 +175,16 @@ 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()) {
+        clearScopedStyleResolver();
+        if (m_registeredWithParentShadowRoot) {
+            ShadowRoot* root = host()->containingShadowRoot();
+            if (!root)
+                root = insertionPoint->containingShadowRoot();
+            if (root)
+                root->removeChildShadowRoot();
+            m_registeredWithParentShadowRoot = false;
+        }
     }
 
     DocumentFragment::removedFrom(insertionPoint);