simplify IServerCallHandler

src/csharp/Grpc.Core/Internal/ServerCallHandler.cs

@@ -31,7 +31,6 @@ namespace Grpc.Core.Internal
     internal interface IServerCallHandler
     {
         Task HandleCall(ServerRpcNew newRpc, CompletionQueueSafeHandle cq);
-        IServerCallHandler Intercept(Interceptor interceptor);
     }
 
     internal class UnaryServerCallHandler<TRequest, TResponse> : IServerCallHandler
@@ -91,11 +90,6 @@ namespace Grpc.Core.Internal
             }
             await finishedTask.ConfigureAwait(false);
         }
-
-        public IServerCallHandler Intercept(Interceptor interceptor)
-        {
-            return new UnaryServerCallHandler<TRequest, TResponse>(method, (request, context) => interceptor.UnaryServerHandler(request, context, handler));
-        }
     }
 
     internal class ServerStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler
@@ -154,11 +148,6 @@ namespace Grpc.Core.Internal
             }
             await finishedTask.ConfigureAwait(false);
         }
-
-        public IServerCallHandler Intercept(Interceptor interceptor)
-        {
-            return new ServerStreamingServerCallHandler<TRequest, TResponse>(method, (request, responseStream, context) => interceptor.ServerStreamingServerHandler(request, responseStream, context, handler));
-        }
     }
 
     internal class ClientStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler
@@ -217,11 +206,6 @@ namespace Grpc.Core.Internal
             }
             await finishedTask.ConfigureAwait(false);
         }
-
-        public IServerCallHandler Intercept(Interceptor interceptor)
-        {
-            return new ClientStreamingServerCallHandler<TRequest, TResponse>(method, (requestStream, context) => interceptor.ClientStreamingServerHandler(requestStream, context, handler));
-        }
     }
 
     internal class DuplexStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler
@@ -277,11 +261,6 @@ namespace Grpc.Core.Internal
             }
             await finishedTask.ConfigureAwait(false);
         }
-
-        public IServerCallHandler Intercept(Interceptor interceptor)
-        {
-            return new DuplexStreamingServerCallHandler<TRequest, TResponse>(method, (requestStream, responseStream, context) => interceptor.DuplexStreamingServerHandler(requestStream, responseStream, context, handler));
-        }
     }
 
     internal class UnimplementedMethodCallHandler : IServerCallHandler
@@ -310,11 +289,6 @@ namespace Grpc.Core.Internal
         {
             return callHandlerImpl.HandleCall(newRpc, cq);
         }
-
-        public IServerCallHandler Intercept(Interceptor interceptor)
-        {
-            return this;  // Do not intercept unimplemented methods.
-        }
     }
 
     internal static class HandlerUtils