Use package:sky imports consistently

sky/sdk/lib/widgets/widget.dart

Index: sky/sdk/lib/widgets/widget.dart
diff --git a/sky/sdk/lib/widgets/widget.dart b/sky/sdk/lib/widgets/widget.dart
index 4626da58e255a67887eeef512534cae7e2c828fb..042f0dd01c99757afe68271384bb54579f8ae510 100644
--- a/sky/sdk/lib/widgets/widget.dart
+++ b/sky/sdk/lib/widgets/widget.dart
@@ -6,17 +6,16 @@ import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 
+import 'package:sky/base/debug.dart';
+import 'package:sky/base/hit_test.dart';
 import 'package:sky/mojo/activity.dart' as activity;
+import 'package:sky/rendering/box.dart';
+import 'package:sky/rendering/object.dart';
+import 'package:sky/rendering/sky_binding.dart';
 
-import '../base/debug.dart';
-import '../base/hit_test.dart';
-import '../rendering/box.dart';
-import '../rendering/object.dart';
-import '../rendering/sky_binding.dart';
-
-export '../rendering/box.dart' show BoxConstraints, BoxDecoration, Border, BorderSide, EdgeDims;
-export '../rendering/flex.dart' show FlexDirection;
-export '../rendering/object.dart' show Point, Offset, Size, Rect, Color, Paint, Path;
+export 'package:sky/rendering/box.dart' show BoxConstraints, BoxDecoration, Border, BorderSide, EdgeDims;
+export 'package:sky/rendering/flex.dart' show FlexDirection;
+export 'package:sky/rendering/object.dart' show Point, Offset, Size, Rect, Color, Paint, Path;
 
 final bool _shouldLogRenderDuration = false;