Generate toFooElement() functions from tagname data

Source/core/html/HTMLCanvasElement.h

Index: Source/core/html/HTMLCanvasElement.h
diff --git a/Source/core/html/HTMLCanvasElement.h b/Source/core/html/HTMLCanvasElement.h
index a9daa99a7e7298f5470622f564895a2581d30e10..93e69f437d6d9582ac318846001757f39afee574 100644
--- a/Source/core/html/HTMLCanvasElement.h
+++ b/Source/core/html/HTMLCanvasElement.h
@@ -179,12 +179,6 @@ private:
     mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
 };
 
-inline HTMLCanvasElement* toHTMLCanvasElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::canvasTag));
-    return static_cast<HTMLCanvasElement*>(node);
-}
-
 } //namespace
 
 #endif