Format samples and samples-dev directories.

samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart

Index: samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart
diff --git a/samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart b/samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart
index b545ea47f61d8050404e153fd128e2c9e725e953..ebc7ad109aaf896b6eee06d794dd70636c28b151 100644
--- a/samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart
+++ b/samples-dev/swarm/swarm_ui_lib/observable/ChangeEvent.dart
@@ -47,16 +47,21 @@ class ChangeEvent {
   /** Factory constructor for property change events. */
   ChangeEvent.property(
       this.target, this.propertyName, this.newValue, this.oldValue)
-    : type = UPDATE, index = null;
+      : type = UPDATE,
+        index = null;
 
   /** Factory constructor for list change events. */
   ChangeEvent.list(
       this.target, this.type, this.index, this.newValue, this.oldValue)
-    : propertyName = null;
+      : propertyName = null;
 
   /** Factory constructor for [GLOBAL] change events. */
   ChangeEvent.global(this.target)
-    : type = GLOBAL, newValue = null, oldValue = null, propertyName = null, index = null;
+      : type = GLOBAL,
+        newValue = null,
+        oldValue = null,
+        propertyName = null,
+        index = null;
 }
 
 /** A collection of change events on a single observable instance. */