Introduce toHTMLLinkElement

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 96c12d4a27c7a442456d64ac5e381a08ee2e8d92..7b2b3e19dc6e22862cbf27c81fa3109808fadf5b 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -3871,7 +3871,7 @@ KURL Document::openSearchDescriptionURL()
     for (unsigned i = 0; Node* child = children->item(i); i++) {
         if (!child->hasTagName(linkTag))
             continue;
-        HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(child);
+        HTMLLinkElement* linkElement = toHTMLLinkElement(child);
         if (!equalIgnoringCase(linkElement->type(), openSearchMIMEType) || !equalIgnoringCase(linkElement->rel(), openSearchRelation))
             continue;
         if (linkElement->href().isEmpty())
@@ -4141,7 +4141,7 @@ const Vector<IconURL>& Document::iconURLs(int iconTypesMask)
         Node* child = children->item(i);
         if (!child->hasTagName(linkTag))
             continue;
-        HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(child);
+        HTMLLinkElement* linkElement = toHTMLLinkElement(child);
         if (!(linkElement->iconType() & iconTypesMask))
             continue;
         if (linkElement->href().isEmpty())