Fix test build break

test/Microsoft.DotNet.ProjectModel.Server.Tests/Helpers/DthMessageExtension.cs

@@ -48,30 +48,6 @@ namespace Microsoft.DotNet.ProjectModel.Server.Tests
             return payload;
         }
 
-        public static JObject RetrieveCompilationDiagnostics(this DthMessage message, string frameworkShortName)
-        {
-            Assert.NotNull(message);
-            Assert.Equal(MessageTypes.AllDiagnostics, message.MessageType);
-
-            Assert.True(message.Payload is JArray);
-            var payload = (JArray)message.Payload;
-
-            foreach (var each in payload)
-            {
-                Assert.True(each is JObject);
-                var diagnosticsOfFramework = (JObject)each;
-
-                if (string.Equals(diagnosticsOfFramework["Framework"]["ShortName"].Value<string>(),
-                                  frameworkShortName,
-                                  StringComparison.OrdinalIgnoreCase))
-                {
-                    return diagnosticsOfFramework;
-                }
-            }
-
-            return null;
-        }
-
         public static T RetrievePayloadAs<T>(this DthMessage message)
             where T : JToken
         {