Update :link/:visited style when changing href.

Source/core/html/HTMLAnchorElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 178 matching lines @@
         }
     }
     HTMLElement::attributeWillChange(name, oldValue, newValue);
 }
 
 void HTMLAnchorElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == hrefAttr) {
         bool wasLink = isLink();
         setIsLink(!value.isNull());
-        if (wasLink != isLink()) {
-            didAffectSelector(AffectedSelectorLink | AffectedSelectorVisited | AffectedSelectorEnabled);
-            if (wasLink && treeScope().adjustedFocusedElement() == this) {
-                // We might want to call blur(), but it's dangerous to dispatch
-                // events here.
-                document().setNeedsFocusedElementCheck();
-            }
+        if (wasLink || isLink()) {
+            AffectedSelectorMask affectedPseudo = AffectedSelectorLink | AffectedSelectorVisited;
+            if (wasLink != isLink())
+                affectedPseudo |= AffectedSelectorEnabled;
+            didAffectSelector(affectedPseudo);
+        }
+        if (wasLink && !isLink() && treeScope().adjustedFocusedElement() == this) {
+            // We might want to call blur(), but it's dangerous to dispatch
+            // events here.
+            document().setNeedsFocusedElementCheck();
         }
         if (isLink()) {
             String parsedURL = stripLeadingAndTrailingHTMLSpaces(value);
             if (document().isDNSPrefetchEnabled()) {
                 if (protocolIs(parsedURL, "http") || protocolIs(parsedURL, "https") || parsedURL.startsWith("//"))
                     prefetchDNS(document().completeURL(parsedURL).host());
             }
         }
         invalidateCachedVisitedLinkHash();
     } else if (name == nameAttr || name == titleAttr) {
@@ skipping 178 matching lines @@
             Vector<String> argv;
             argv.append("a");
             argv.append(fastGetAttribute(hrefAttr));
             activityLogger->logEvent("blinkAddElement", argv.size(), argv.data());
         }
     }
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 }