Remove support for old package layouts.

utils/tests/pub/install/pub_install_test.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 pub_tests;
 
 import 'dart:io';
 
 import '../test_pub.dart';
 import '../../../../pkg/unittest/lib/unittest.dart';
@@ skipping 71 matching lines @@
         ])
       ])
     ]).scheduleCreate();
 
     dir(appPath, [
       pubspec({"name": "myapp", "dependencies": {"foo": {"sdk": "foo"}}})
     ]).scheduleCreate();
 
     schedulePub(args: ['install'],
         error: new RegExp(r'Warning: Package "foo" does not have a "lib" '
-            'directory.'),
+            'directory so you will not be able to import any libraries from '
+            'it.'),
         output: new RegExp(r"Dependencies installed!$"));
 
     run();
   });
 
   test('does not warn if the root package lacks a "lib" directory', () {
     dir(appPath, [
       appPubspec([])
     ]).scheduleCreate();
 
@@ skipping 162 matching lines @@
             dir("myapp", [
               file('foo.dart', 'main() => "foo";')
             ])
           ])
         ])
       ]).scheduleValidate();
 
       run();
     });
   });
-
-  // TODO(rnystrom): Remove this when old layout support is removed. (#4964)
-  test('shows a warning if the entrypoint uses the old layout', () {
-    // The symlink should use the name in the pubspec, not the name of the
-    // directory.
-    dir(appPath, [
-      pubspec({"name": "myapp_name"}),
-      file("foo.dart", 'main() => "foo";'),
-    ]).scheduleCreate();
-
-    schedulePub(args: ['install'],
-        error: '''
-        Warning: Package "myapp_name" is using a deprecated layout.
-        See http://www.dartlang.org/docs/pub-package-manager/package-layout.html for details.
-        ''',
-        output: new RegExp(r"Dependencies installed!$"));
-
-    run();
-  });
 }