Remove redundant call to ValidateMethodConstraints().

Fix demo application.

ICSharpCode.NRefactory.CSharp/Resolver/OverloadResolution.cs

@@ -249,7 +249,6 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 			RunTypeInference(candidate);
 			CheckApplicability(candidate);
 			ConsiderIfNewCandidateIsBest(candidate);
-			ValidateMethodConstraints(candidate);
 			return true;
 		}
 		

ICSharpCode.NRefactory.Demo/CSDemo.cs

@@ -65,7 +65,7 @@ namespace ICSharpCode.NRefactory.Demo
 		
 		void CSharpParseButtonClick(object sender, EventArgs e)
 		{
-			syntaxTree = SyntaxTree.Parse(csharpCodeTextBox.Text);
+			syntaxTree = new CSharpParser().Parse(csharpCodeTextBox.Text, "demo.cs");
 			csharpTreeView.Nodes.Clear();
 			foreach (var element in syntaxTree.Children) {
 				csharpTreeView.Nodes.Add(MakeTreeNode(element));