Remove custom style callbacks.

sky/engine/core/dom/shadow/ShadowRoot.cpp

 /*
  * 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 87 matching lines @@
 #endif
 
 PassRefPtr<Node> ShadowRoot::cloneNode(bool, ExceptionState& exceptionState)
 {
     exceptionState.throwDOMException(DataCloneError, "ShadowRoot nodes are not clonable.");
     return nullptr;
 }
 
 void ShadowRoot::recalcStyle(StyleRecalcChange change)
 {
-    // ShadowRoot doesn't support custom callbacks.
-    ASSERT(!hasCustomStyleCallbacks());
-
     if (styleChangeType() >= SubtreeStyleChange)
         change = Force;
 
     // There's no style to update so just calling recalcStyle means we're updated.
     clearNeedsStyleRecalc();
 
     // FIXME: This doesn't handle :hover + div properly like Element::recalcStyle does.
     Text* lastTextNode = 0;
     for (Node* child = lastChild(); child; child = child->previousSibling()) {
         if (child->isTextNode()) {
@@ skipping 174 matching lines @@
 void ShadowRoot::trace(Visitor* visitor)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 }