Refactoring: Make LinkStyle instantiation lazy

Source/core/html/HTMLLinkElement.h

Index: Source/core/html/HTMLLinkElement.h
diff --git a/Source/core/html/HTMLLinkElement.h b/Source/core/html/HTMLLinkElement.h
index 49f1b19ad5805b168f501688ff9e8eb15b97317c..ce818a1d95ce7789c3df7ab63d6199bdfacaf6bb 100644
--- a/Source/core/html/HTMLLinkElement.h
+++ b/Source/core/html/HTMLLinkElement.h
@@ -141,11 +141,14 @@ public:
     // For LinkStyle
     bool loadLink(const String& type, const KURL& url) { return m_linkLoader.loadLink(m_relAttribute, type, url, document()); }
     bool isAlternate() const { return m_link->isUnset() && m_relAttribute.isAlternate(); }
-    bool shouldProcessStyle();
+    bool shouldProcessStyle() { return linkStyleToProcess(); }
 
 private:
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
+    LinkStyle* linkStyle() const { return m_link.get(); }
+    LinkStyle* linkStyleToProcess();
+
     void process();
     static void processCallback(Node*);