Remove LayoutHelper.MeasureDecorator.

No longer needed as most of the logic was moved to MeasureCore.

Perspex.Controls/Border.cs

@@ -52,11 +52,16 @@ namespace Perspex.Controls
 
         protected override Size MeasureOverride(Size availableSize)
         {
-            return LayoutHelper.MeasureDecorator(
-                this, 
-                this.Content, 
-                availableSize, 
-                this.Padding + new Thickness(this.BorderThickness));
+            var content = this.Content;
+            var padding = this.Padding + new Thickness(this.BorderThickness);
+
+            if (content != null)
+            {
+                content.Measure(availableSize.Deflate(padding));
+                return content.DesiredSize.Value.Inflate(padding);
+            }
+
+            return new Size();
         }
     }
 }

Perspex.Controls/Decorator.cs

@@ -59,7 +59,16 @@ namespace Perspex.Controls
 
         protected override Size MeasureOverride(Size availableSize)
         {
-            return LayoutHelper.MeasureDecorator(this, this.Content, availableSize, this.Padding);
+            var content = this.Content;
+            var padding = this.Padding;
+
+            if (content != null)
+            {
+                content.Measure(availableSize.Deflate(padding));
+                return content.DesiredSize.Value.Inflate(padding);
+            }
+
+            return new Size();
         }
     }
 }

Perspex.Layout/LayoutHelper.cs

@@ -20,35 +20,5 @@ namespace Perspex.Layout
             height = Math.Max(height, control.MinHeight);
             return new Size(width, height);
         }
-        
-        public static Size MeasureDecorator(
-            ILayoutable decorator,
-            ILayoutable content,
-            Size availableSize, 
-            Thickness padding)
-        {
-            double width = 0;
-            double height = 0;
-
-            if (content != null)
-            {
-                content.Measure(availableSize.Deflate(padding));
-                Size s = content.DesiredSize.Value.Inflate(padding);
-                width = s.Width;
-                height = s.Height;
-            }
-
-            if (decorator.Width > 0)
-            {
-                width = decorator.Width;
-            }
-
-            if (decorator.Height > 0)
-            {
-                height = decorator.Height;
-            }
-
-            return new Size(width, height);
-        }
     }
 }