Remove deprecated UrlRequestContextConfig & HttpUrlRequestFactoryConfig

components/cronet/android/api/src/org/chromium/net/UrlRequestContextConfig.java

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.net;
-
-/**
- * A config for CronetEngine, which allows runtime configuration of
- * CronetEngine.
- * @deprecated use {@link CronetEngine.Builder} instead.
- */
-@Deprecated
-public class UrlRequestContextConfig extends CronetEngine.Builder {
-    public UrlRequestContextConfig() {
-        // Context will be passed in later when the ChromiumUrlRequestFactory
-        // or ChromiumUrlRequestContext is created.
-        super(null);
-    }
-}