Fix a line of indentation in barback.

pkg/barback/lib/src/phase_input.dart

 // Copyright (c) 2013, 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 barback.phase_input;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'asset.dart';
@@ skipping 70 matching lines @@
   /// Whether this input is dirty and needs [process] to be called.
   bool get isDirty => _adjustTransformersFuture != null ||
       _newPassThrough || _transforms.any((transform) => transform.isDirty);
 
   /// A stream that emits an event whenever any transforms that use [input] as
   /// their primary input log an entry.
   Stream<LogEntry> get onLog => _onLogPool.stream;
   final _onLogPool = new StreamPool<LogEntry>.broadcast();
 
   PhaseInput(this._phase, AssetNode input, Iterable<Transformer> transformers,
-        this._location)
+      this._location)
       : _transformers = transformers.toSet(),
         _inputForwarder = new AssetForwarder(input) {
     _onDirtyPool.add(_onDirtyController.stream);
 
     input.onStateChange.listen((state) {
       if (state.isRemoved) {
         remove();
       } else if (_adjustTransformersFuture == null) {
         _adjustTransformers();
       }
@@ skipping 211 matching lines @@
     }
 
     return Future.wait(_transforms.map((transform) {
       if (!transform.isDirty) return new Future.value(new Set());
       return transform.apply();
     })).then((outputs) => unionAll(outputs));
   }
 
   String toString() => "phase input in $_location for $input";
 }