[logdog] Remove list functionality.

logdog/client/coordinator/client_test.go

 // Copyright 2015 The LUCI Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 30 matching lines @@
         panic("not implemented")
 }
 
 func (s *testLogsServiceBase) Tail(c context.Context, req *logdog.TailRequest) (*logdog.GetResponse, error) {
         panic("not implemented")
 }
 
 func (s *testLogsServiceBase) Query(c context.Context, req *logdog.QueryRequest) (*logdog.QueryResponse, error) {
         panic("not implemented")
 }
-
-func (s *testLogsServiceBase) List(c context.Context, req *logdog.ListRequest) (*logdog.ListResponse, error) {
-        panic("not implemented")
-}