Clean up a bunch of our Dart code.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:typed_data';
 import 'object.dart';
 import '../painting/shadows.dart';
 import 'package:vector_math/vector_math.dart';
@@ skipping 115 matching lines @@
                               maxWidth: maxWidth,
                               minHeight: minHeight,
                               maxHeight: math.min(maxHeight, height));
   }
 
   final double minWidth;
   final double maxWidth;
   final double minHeight;
   final double maxHeight;
 
+  static 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));
+  }
+
   double constrainWidth(double width) {
-    return clamp(min: minWidth, max: maxWidth, value: width);
+    return _clamp(min: minWidth, max: maxWidth, value: width);
   }
 
   double constrainHeight(double height) {
-    return clamp(min: minHeight, max: maxHeight, value: height);
+    return _clamp(min: minHeight, max: maxHeight, value: height);
   }
 
   Size constrain(Size size) {
     return new Size(constrainWidth(size.width), constrainHeight(size.height));
   }
 
   bool get isInfinite => maxWidth >= double.INFINITY || maxHeight >= double.INFINITY;
 
   int get hashCode {
     int value = 373;
@@ skipping 461 matching lines @@
   String toString() => 'BorderSide($color, $width)';
 }
 
 class Border {
   const Border({
     this.top: BorderSide.none,
     this.right: BorderSide.none,
     this.bottom: BorderSide.none,
     this.left: BorderSide.none
   });
+
   const Border.all(BorderSide side) :
     top = side,
     right = side,
     bottom = side,
     left = side;
+
   final BorderSide top;
   final BorderSide right;
   final BorderSide bottom;
   final BorderSide left;
 
   int get hashCode {
     int value = 373;
     value = 37 * value * top.hashCode;
     value = 37 * value * right.hashCode;
     value = 37 * value * bottom.hashCode;
@@ skipping 384 matching lines @@
 
   void defaultPaint(RenderObjectDisplayList canvas) {
     RenderBox child = firstChild;
     while (child != null) {
       assert(child.parentData is ParentDataType);
       canvas.paintChild(child, child.parentData.position);
       child = child.parentData.nextSibling;
     }
   }
 }