No need to serialize the entire test case if we don't use it

xunit.runner.data/TestCaseData.cs

@@ -1,10 +1,6 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Runtime.Serialization.Formatters.Binary;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace xunit.runner.data
 {
@@ -15,9 +11,8 @@ namespace xunit.runner.data
         public string AssemblyPath { get; set; }
         public Dictionary<string, List<string>> TraitMap { get; set; }
 
-        public TestCaseData(string serializedForm, string displayName, string assemblyPath, Dictionary<string, List<string>> traitMap)
+        public TestCaseData(string displayName, string assemblyPath, Dictionary<string, List<string>> traitMap)
         {
-            SerializedForm = serializedForm;
             DisplayName = displayName;
             AssemblyPath = assemblyPath;
             TraitMap = traitMap;
@@ -26,17 +21,15 @@ namespace xunit.runner.data
         public static TestCaseData ReadFrom(BinaryReader reader)
         {
             var formatter = new BinaryFormatter();
-            var serializedForm = reader.ReadString();
             var displayName = reader.ReadString();
             var assemblyPath = reader.ReadString();
             var traitMap = (Dictionary<string, List<string>>)formatter.Deserialize(reader.BaseStream);
-            return new TestCaseData(serializedForm, displayName, assemblyPath, traitMap);
+            return new TestCaseData(displayName, assemblyPath, traitMap);
         }
 
         public void WriteTo(BinaryWriter writer)
         {
             var formatter = new BinaryFormatter();
-            writer.Write(SerializedForm);
             writer.Write(DisplayName);
             writer.Write(AssemblyPath);
             formatter.Serialize(writer.BaseStream, TraitMap);

xunit.runner.worker/DiscoverUtil.cs

@@ -29,7 +29,6 @@ namespace xunit.runner.worker
             {
                 var testCase = testCaseDiscovered.TestCase;
                 var testCaseData = new TestCaseData(
-                    _discoverer.Serialize(testCase),
                     testCase.DisplayName,
                     testCaseDiscovered.TestAssembly.Assembly.AssemblyPath,
                     testCase.Traits);