remove now usused code

src/matrix/e2ee/megolm/decryption/SessionInfo.js

@@ -1,49 +0,0 @@
-/*
-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.
-*/
-
-/**
- * session loaded in memory with everything needed to create DecryptionResults
- * and to store/retrieve it in the SessionCache
- */
-export class SessionInfo {
-    constructor(roomId, senderKey, session, claimedKeys) {
-        this.roomId = roomId;
-        this.senderKey = senderKey;
-        this.session = session;
-        this.claimedKeys = claimedKeys;
-        this._refCounter = 0;
-    }
-
-    get sessionId() {
-        return this.session?.session_id();
-    }
-
-    retain() {
-        this._refCounter += 1;
-    }
-
-    release() {
-        this._refCounter -= 1;
-        if (this._refCounter <= 0) {
-            this.dispose();
-        }
-    }
-
-    dispose() {
-        this.session.free();
-        this.session = null;
-    }
-}