Revert "Add Session::abort_save() to Kohana."

Obsoleted by upstream fix.

This reverts commit 06f066164f.

system/libraries/Session.php

@@ -27,9 +27,6 @@ class Session_Core {
 	// Input library
 	protected $input;
 
-        // Automatically save the session by default
-        public static $should_save = true;
-
 	/**
 	 * Singleton instance of Session.
 	 */
@@ -458,14 +455,4 @@ class Session_Core {
 		}
 	}
 
-        /**
-         * Do not save this session.
-         *
-         * @return  void
-         */
-        public function abort_save() {
-                Session::$should_save = false;
-
-        }
-
 } // End Session Class