Use ContainerNode::hasChildren() instead of firstChild() in conditionals

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 f40b584c220fcac922d3a32ff2eba68369ba0b9e..3bf180deaa441f9322fe31f1082587ad091de51a 100644
--- a/Source/core/dom/Position.cpp
+++ b/Source/core/dom/Position.cpp
@@ -497,7 +497,7 @@ static bool endsOfNodeAreVisuallyDistinctPositions(Node* node)
         return true;
 
     // There is a VisiblePosition inside an empty inline-block container.
-    return node->renderer()->isReplaced() && canHaveChildrenForEditing(node) && toRenderBox(node->renderer())->height() != 0 && !node->firstChild();
+    return node->renderer()->isReplaced() && canHaveChildrenForEditing(node) && toRenderBox(node->renderer())->height() != 0 && !node->hasChildren();
 }
 
 static Node* enclosingVisualBoundary(Node* node)