Make "pub run foo" run "pub run foo:foo" rather than "pub run bin/foo"

sdk/lib/_internal/pub/test/run/mode_test.dart

 // Copyright (c) 2014, 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.
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const TRANSFORMER = """
 import 'dart:async';
 
@@ skipping 25 matching lines @@
         }),
         d.dir("lib", [d.dir("src", [
           d.file("transformer.dart", TRANSFORMER),
           d.file("primary.in", "")
         ])])
       ]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       // By default it should run in debug mode.
-      var pub = pubRun(args: ["script"]);
+      var pub = pubRun(args: ["bin/script"]);
       pub.stdout.expect("debug");
       pub.shouldExit();
 
       // A custom mode should be specifiable.
-      pub = pubRun(args: ["--mode", "custom-mode", "script"]);
+      pub = pubRun(args: ["--mode", "custom-mode", "bin/script"]);
       pub.stdout.expect("custom-mode");
       pub.shouldExit();
     });
 
     integration('runs a dependency script with customizable modes', () {
       d.dir("foo", [
         d.pubspec({
           "name": "foo",
           "version": "1.2.3",
           "transformers": ["foo/src/transformer"]
@@ skipping 13 matching lines @@
       pub.stdout.expect("release");
       pub.shouldExit();
 
       // A custom mode should be specifiable.
       pub = pubRun(args: ["--mode", "custom-mode", "foo:script"]);
       pub.stdout.expect("custom-mode");
       pub.shouldExit();
     });
   });
 }