Introduce isHTMLTableElement and toHTMLTableElement

Source/core/dom/Position.cpp

Index: Source/core/dom/Position.cpp
diff --git a/Source/core/dom/Position.cpp b/Source/core/dom/Position.cpp
index 627bfa1466bff644f19f38cbb352f817e65a2df5..61aba0102e29d8a3d93b9c6d99b07526d24c5af8 100644
--- a/Source/core/dom/Position.cpp
+++ b/Source/core/dom/Position.cpp
@@ -35,6 +35,7 @@
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
+#include "core/html/HTMLTableElement.h"
 #include "core/platform/Logging.h"
 #include "core/rendering/InlineIterator.h"
 #include "core/rendering/InlineTextBox.h"
@@ -548,7 +549,7 @@ static bool endsOfNodeAreVisuallyDistinctPositions(Node* node)
         return true;
 
     // Don't include inline tables.
-    if (node->hasTagName(tableTag))
+    if (isHTMLTableElement(node))
         return false;
 
     // There is a VisiblePosition inside an empty inline-block container.