Move frog/leg to lib/compiler/implementation.

frog/leg/colors.dart

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#library('colors');
-
-final String GREEN_COLOR = '\u001b[32m';
-final String RED_COLOR = '\u001b[31m';
-final String MAGENTA_COLOR = '\u001b[35m';
-final String NO_COLOR = '\u001b[0m';
-
-String green(String string) => "${GREEN_COLOR}$string${NO_COLOR}";
-String red(String string) => "${RED_COLOR}$string${NO_COLOR}";
-String magenta(String string) => "${MAGENTA_COLOR}$string${NO_COLOR}";