Rename "BorderSide.None" to "BorderSide.none", since it's a constant, and...

Rename "BorderSide.None" to "BorderSide.none", since it's a constant, and change the sky.Size.infinite() constructor to a constant.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/1158263005

examples/game/lib/sprite_box.dart

@@ -38,7 +38,7 @@ class SpriteBox extends RenderBox {
   double get systemHeight => _systemHeight;
 
   void performLayout() {
-    size = constraints.constrain(new Size.infinite());
+    size = constraints.constrain(Size.infinite);
   }
 
   void handleEvent(Event event) {

examples/raw/ink_well.dart

@@ -52,7 +52,7 @@ class InkWell extends RenderBox {
   }
 
   void performLayout() {
-    size = constraints.constrain(new sky.Size.infinite());
+    size = constraints.constrain(sky.Size.infinite);
   }
 
   void paint(RenderObjectDisplayList canvas) {

examples/raw/touch_demo.dart

@@ -62,7 +62,7 @@ class RenderTouchDemo extends RenderBox {
   }
 
   void performLayout() {
-    size = constraints.constrain(new Size.infinite());
+    size = constraints.constrain(Size.infinite);
   }
 
   void paint(RenderObjectDisplayList canvas) {