Add a "pub global run" command.

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

Index: sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
diff --git a/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart b/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
index daedf2567873e462f16c90f5f8020a0ae9cb2585..cd29aa77a7577e034aa2bb93b30dc6a185ff3c25 100644
--- a/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
+++ b/sdk/lib/_internal/pub/test/run/runs_a_generated_script_test.dart
@@ -4,7 +4,6 @@
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
-import 'utils.dart';
 
 const TRANSFORMER = """
 import 'dart:async';
@@ -41,8 +40,7 @@ main() {
 
       createLockFile('myapp', pkg: ['barback']);
 
-      var pub = pubRun(args: ["script"],
-          transformers: ["myapp/src/transformer"]);
+      var pub = pubRun(args: ["script"]);
 
       pub.stdout.expect("generated");
       pub.shouldExit();