Remove Schema::isLeafList

I missed it in the "Remove Schema::is*" patch.

Change-Id: Ie304d850764498ec58a986a7eba7b948e98c3970
diff --git a/src/schema.hpp b/src/schema.hpp
index 75c1f8f..a1fd5b5 100644
--- a/src/schema.hpp
+++ b/src/schema.hpp
@@ -54,7 +54,6 @@
 public:
     virtual ~Schema();
 
-    bool isLeafList(const std::string& path) const;
     virtual yang::NodeTypes nodeType(const std::string& path) const = 0;
     virtual yang::NodeTypes nodeType(const schemaPath_& location, const ModuleNodePair& node) const = 0;
     virtual bool isModule(const std::string& name) const = 0;