Remove publicroomsapi (#1176)

* Remove all of publicroomsapi

* Remove references to publicroomsapi

* Remove doc references to publicroomsapi

clientapi/api/api.go

@@ -0,0 +1,22 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package api
+
+type ExternalPublicRoomsProvider interface {
+	// The list of homeserver domains to query. These servers will receive a request
+	// via this API: https://matrix.org/docs/spec/server_server/latest#public-room-directory
+	// This will be called -on demand- by clients, so cache appropriately!
+	Homeservers() []string
+}