Remove unused code

matrix-sdk-android-rx/src/main/java/org/matrix/android/sdk/rx/RxCallbackBuilders.kt

@@ -1,56 +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.
- */
-
-package org.matrix.android.sdk.rx
-
-import org.matrix.android.sdk.api.MatrixCallback
-import org.matrix.android.sdk.api.util.Cancelable
-import io.reactivex.Completable
-import io.reactivex.Single
-
-fun <T> singleBuilder(builder: (MatrixCallback<T>) -> Cancelable): Single<T> = Single.create { emitter ->
-    val callback = object : MatrixCallback<T> {
-        override fun onSuccess(data: T) {
-            // Add `!!` to fix the warning:
-            // "Type mismatch: type parameter with nullable bounds is used T is used where T was expected. This warning will become an error soon"
-            emitter.onSuccess(data!!)
-        }
-
-        override fun onFailure(failure: Throwable) {
-            emitter.tryOnError(failure)
-        }
-    }
-    val cancelable = builder(callback)
-    emitter.setCancellable {
-        cancelable.cancel()
-    }
-}
-
-fun <T> completableBuilder(builder: (MatrixCallback<T>) -> Cancelable): Completable = Completable.create { emitter ->
-    val callback = object : MatrixCallback<T> {
-        override fun onSuccess(data: T) {
-            emitter.onComplete()
-        }
-
-        override fun onFailure(failure: Throwable) {
-            emitter.tryOnError(failure)
-        }
-    }
-    val cancelable = builder(callback)
-    emitter.setCancellable {
-        cancelable.cancel()
-    }
-}