Get rid of deferred binding for usage errors.

sdk/lib/_internal/pub/lib/src/command/run.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.
 
 library pub.command.run;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:barback/barback.dart';
@@ skipping 26 matching lines @@
     var args = commandOptions.rest.skip(1).toList();
 
     // A command like "foo:bar" runs the "bar" script from the "foo" package.
     // If there is no colon prefix, default to the root package.
     if (executable.contains(":")) {
       var components = split1(executable, ":");
       package = components[0];
       executable = components[1];
     }
 
-    return runExecutable(entrypoint, package, executable, args)
+    return runExecutable(this, entrypoint, package, executable, args)
         .then(flushThenExit);
   }
 }