Setting the link title may change the preferred set.

third_party/WebKit/Source/core/html/HTMLLinkElement.h

Index: third_party/WebKit/Source/core/html/HTMLLinkElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLLinkElement.h b/third_party/WebKit/Source/core/html/HTMLLinkElement.h
index 8a0a2e3edc2e004165193e5a7f8329995037fa13..ea17f4b07d9560242a280c221a005a40f14e7eb0 100644
--- a/third_party/WebKit/Source/core/html/HTMLLinkElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLLinkElement.h
@@ -28,7 +28,7 @@
 #include "core/css/CSSStyleSheet.h"
 #include "core/dom/DOMTokenList.h"
 #include "core/dom/IconURL.h"
-#include "core/dom/StyleEngineContext.h"
+#include "core/dom/StyleEngine.h"
 #include "core/fetch/ResourceOwner.h"
 #include "core/fetch/StyleSheetResource.h"
 #include "core/fetch/StyleSheetResourceClient.h"
@@ -76,7 +76,7 @@ public:
     bool sheetLoaded();
 
     void setDisabledState(bool);
-    void setSheetTitle(const String&);
+    void setSheetTitle(const String&, StyleEngine::ActiveSheetsUpdate = StyleEngine::DontUpdateActiveSheets);
 
     bool styleSheetIsLoading() const;
     bool hasSheet() const { return m_sheet; }