Use default argument value instead of overloading for MarkupAccumulator::serializeNodes()

Source/core/editing/MarkupAccumulator.cpp

Index: Source/core/editing/MarkupAccumulator.cpp
diff --git a/Source/core/editing/MarkupAccumulator.cpp b/Source/core/editing/MarkupAccumulator.cpp
index 9d5b975badca5c8c10c51e79809c9e6d21dd3265..09bd7fe3c4f9ee273823cfee7c14d2c2a73efe6a 100644
--- a/Source/core/editing/MarkupAccumulator.cpp
+++ b/Source/core/editing/MarkupAccumulator.cpp
@@ -111,11 +111,6 @@ MarkupAccumulator::~MarkupAccumulator()
 {
 }
 
-String MarkupAccumulator::serializeNodes(Node* targetNode, EChildrenOnly childrenOnly)
-{
-    return serializeNodes(targetNode, childrenOnly, 0);
-}
-
 String MarkupAccumulator::serializeNodes(Node* targetNode, EChildrenOnly childrenOnly, Vector<QualifiedName>* tagNamesToSkip)
 {
     serializeNodesWithNamespaces(targetNode, childrenOnly, 0, tagNamesToSkip);