Removed unused _run_suites

tool/lib/test/unit.rb

@@ -1339,14 +1339,6 @@ module Test
         status
       end
 
-      ##
-      # Runs all the +suites+ for a given +type+.
-      #
-
-      def _run_suites suites, type
-        suites.map { |suite| _run_suite suite, type }
-      end
-
       ##
       # Run a single +suite+ for a given +type+.