Clean up a bunch of our Dart code.

sky/sdk/lib/framework/rendering/object.dart

Index: sky/sdk/lib/framework/rendering/object.dart
diff --git a/sky/sdk/lib/framework/rendering/object.dart b/sky/sdk/lib/framework/rendering/object.dart
index 34e3e89060e33a17e35d385dd7543d4f2581cdb7..e6f8ba72814da5726e8fff04dd6e7190e94ad1ff 100644
--- a/sky/sdk/lib/framework/rendering/object.dart
+++ b/sky/sdk/lib/framework/rendering/object.dart
@@ -23,13 +23,6 @@ class ParentData {
 
 const kLayoutDirections = 4;
 
-double clamp({double min: 0.0, double value: 0.0, double max: double.INFINITY}) {
-  assert(min != null);
-  assert(value != null);
-  assert(max != null);
-  return math.max(min, math.min(max, value));
-}
-
 class RenderObjectDisplayList extends sky.PictureRecorder {
   RenderObjectDisplayList(double width, double height) : super(width, height);
   void paintChild(RenderObject child, Point position) {