set Dimension::getId as final

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 This is a changelog for Piwik platform developers. All changes for our HTTP API's, Plugins, Themes, etc will be listed here.
 
+## Piwik 2.15.0
+
+### Breaking Changes
+* We marked the method `Dimension::getId()` as final.
+
 ## Piwik 2.14.0
 
 ### Breaking Changes

core/Columns/Dimension.php

@@ -149,7 +149,7 @@ abstract class Dimension
      *                   This would only happen if the dimension is located in the wrong directory.
      * @api
      */
-    public function getId()
+    final public function getId()
     {
         $className = get_class($this);