Use type cast macro for AnimatableLengthPoint|3D instead of manual toFoo()

Source/core/accessibility/AXTable.cpp

Index: Source/core/accessibility/AXTable.cpp
diff --git a/Source/core/accessibility/AXTable.cpp b/Source/core/accessibility/AXTable.cpp
index f40655cf7bb3e6a6d78d97b99ffc87ff047d94fb..d1c8f77ba3a435399f362a6ef1004f58a833c5b7 100644
--- a/Source/core/accessibility/AXTable.cpp
+++ b/Source/core/accessibility/AXTable.cpp
@@ -145,8 +145,7 @@ bool AXTable::isDataTable() const
         if (elementHasAriaRole(rowElement))
             return false;
         if (rowElement->hasTagName(trTag)) {
-            HTMLTableRowElement* row = static_cast<HTMLTableRowElement*>(rowElement);
-            RefPtrWillBeRawPtr<HTMLCollection> cells = row->cells();
+            RefPtrWillBeRawPtr<HTMLCollection> cells = toHTMLTableRowElement(rowElement)->cells();
             for (unsigned cellIndex = 0; cellIndex < cells->length(); ++cellIndex) {
                 if (elementHasAriaRole(cells->item(cellIndex)))
                     return false;