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

Source/core/dom/Text.cpp

Index: Source/core/dom/Text.cpp
diff --git a/Source/core/dom/Text.cpp b/Source/core/dom/Text.cpp
index 3e2e243e4c39fe7fd5f01bfd86ca93834830bb9c..d79941897d3214cac794c0fe4f527a0e75efc44e 100644
--- a/Source/core/dom/Text.cpp
+++ b/Source/core/dom/Text.cpp
@@ -36,6 +36,7 @@
 #include "core/rendering/RenderCombineText.h"
 #include "core/rendering/RenderText.h"
 #include "core/rendering/svg/RenderSVGInlineText.h"
+#include "core/svg/SVGForeignObjectElement.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/StringBuilder.h"
 
@@ -290,7 +291,8 @@ bool Text::textRendererIsNeeded(const RenderStyle& style, const RenderObject& pa
 static bool isSVGText(Text* text)
 {
     Node* parentOrShadowHostNode = text->parentOrShadowHostNode();
-    return parentOrShadowHostNode->isSVGElement() && !parentOrShadowHostNode->hasTagName(SVGNames::foreignObjectTag);
+    ASSERT(parentOrShadowHostNode);
+    return parentOrShadowHostNode->isSVGElement() && !isSVGForeignObjectElement(*parentOrShadowHostNode);
 }
 
 RenderText* Text::createTextRenderer(RenderStyle* style)