Codechange: use smart pointers when creating StringIterators

src/string_base.h

@@ -26,7 +26,7 @@ public:
 	 * Create a new iterator instance.
 	 * @return New iterator instance.
 	 */
-	static StringIterator *Create();
+	static std::unique_ptr<StringIterator> Create();
 
 	virtual ~StringIterator() {}