Remove obsolete comment in ShadowRoot.h

Source/core/dom/shadow/ShadowRoot.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 31 matching lines @@
 class HTMLShadowElement;
 class InsertionPoint;
 class ShadowRootRareData;
 class StyleSheetList;
 
 class CORE_EXPORT ShadowRoot final : public DocumentFragment, public TreeScope, public DoublyLinkedListNode<ShadowRoot> {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ShadowRoot);
     friend class WTF::DoublyLinkedListNode<ShadowRoot>;
 public:
-    // FIXME: We will support multiple shadow subtrees, however current implementation does not work well
-    // if a shadow root is dynamically created. So we prohibit multiple shadow subtrees
-    // in several elements for a while.
-    // See https://bugs.webkit.org/show_bug.cgi?id=77503 and related bugs.
+    // FIXME: Current implementation does not work well if a shadow root is dynamically created.
+    // So multiple shadow subtrees in several elements are prohibited.
+    // See https://github.com/w3c/webcomponents/issues/102 and http://crbug.com/234020
     enum ShadowRootType {
         UserAgentShadowRoot = 0,
         OpenShadowRoot
     };
 
     static PassRefPtrWillBeRawPtr<ShadowRoot> create(Document& document, ShadowRootType type)
     {
         return adoptRefWillBeNoop(new ShadowRoot(document, type));
     }
 
@@ skipping 97 matching lines @@
     return adjustedFocusedElement();
 }
 
 DEFINE_NODE_TYPE_CASTS(ShadowRoot, isShadowRoot());
 DEFINE_TYPE_CASTS(ShadowRoot, TreeScope, treeScope, treeScope->rootNode().isShadowRoot(), treeScope.rootNode().isShadowRoot());
 DEFINE_TYPE_CASTS(TreeScope, ShadowRoot, shadowRoot, true, true);
 
 } // namespace blink
 
 #endif // ShadowRoot_h