[Remoting Android] Remove unused DesktopViewFactory

remoting/android/java/src/org/chromium/chromoting/DesktopViewFactory.java

-// Copyright 2016 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.chromoting;
-
-import org.chromium.chromoting.jni.Client;
-
-/**
- * Interface for creating a implementation specific desktop view.
- */
-public interface DesktopViewFactory {
-    /**
-     * Creates an uninitialized implementation specific desktop view. Initializing and adding the
-     * view should done separately.
-     */
-    DesktopView createDesktopView(Desktop desktop, Client client);
-}