Use new is*Element() helper functions in DOM code

Source/core/dom/ScriptLoader.cpp

Index: Source/core/dom/ScriptLoader.cpp
diff --git a/Source/core/dom/ScriptLoader.cpp b/Source/core/dom/ScriptLoader.cpp
index e3b3a3e55a7a910d8bb6bfd796a11c57d83a77cc..178d8f94253c81b00419843aeb81c5c26bc2e296 100644
--- a/Source/core/dom/ScriptLoader.cpp
+++ b/Source/core/dom/ScriptLoader.cpp
@@ -281,12 +281,14 @@ bool ScriptLoader::fetchScript(const String& sourceUrl)
 
 bool isHTMLScriptLoader(Element* element)
 {
-    return element->hasTagName(HTMLNames::scriptTag);
+    ASSERT(element);
+    return isHTMLScriptElement(*element);
 }
 
 bool isSVGScriptLoader(Element* element)
 {
-    return element->hasTagName(SVGNames::scriptTag);
+    ASSERT(element);
+    return isSVGScriptElement(*element);
 }
 
 void ScriptLoader::executeScript(const ScriptSourceCode& sourceCode)