Ignore title attribute for style elements in shadow trees.

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

Index: third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp b/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
index 3dc0e62a4dd77e6f736a51f031f6e74255e18372..1ac86d88710a704ea6684139e02b5c9ef3f5daef 100644
--- a/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleSheetCandidate.cpp
@@ -93,6 +93,10 @@ bool StyleSheetCandidate::canBeActivated(const String& currentPreferrableName) c
     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;