Ignore title attribute for style elements in shadow trees.

third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp

 /*
  * Copyright (C) 2013 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 75 matching lines @@
 {
     ASSERT(isEnabledAndLoading() || sheet());
     return !isEnabledViaScript() && !title().isEmpty() && !isAlternate() && currentPreferrableName.isEmpty();
 }
 
 bool StyleSheetCandidate::canBeActivated(const String& currentPreferrableName) const
 {
     StyleSheet* sheet = this->sheet();
     if (!sheet || sheet->disabled() || !sheet->isCSSStyleSheet())
         return false;
+
+    if (sheet->ownerNode() && sheet->ownerNode()->isInShadowTree())
+        return true;
+
     const AtomicString& title = this->title();
     if (!isEnabledViaScript() && !title.isEmpty() && title != currentPreferrableName)
         return false;
     if (isAlternate() && title.isEmpty())
         return false;
 
     return true;
 }
 
 StyleSheetCandidate::Type StyleSheetCandidate::typeOf(Node& node)
@@ skipping 29 matching lines @@
         return toSVGStyleElement(node()).sheet();
     case Pi:
         return toProcessingInstruction(node()).sheet();
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace blink