Remove test_duplicate_finder.js

It is instantiated in media_import_handler_unittest, but never used.

Bug: 908290
Change-Id: Ic3e522ec2a4e14b4fc81a6443d77aa1a7622e70f
Reviewed-on: https://chromium-review.googlesource.com/c/1350013
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610760}

ui/file_manager/file_manager/background/js/media_import_handler_unittest.html

@@ -35,7 +35,6 @@
   <script src="task_queue.js"></script>
   <script src="media_import_handler.js"></script>
   <script src="duplicate_finder.js"></script>
-  <script src="test_duplicate_finder.js"></script>
   <script src="volume_info_impl.js"></script>
   <script src="volume_info_list_impl.js"></script>
   <script src="volume_manager_factory.js"></script>

ui/file_manager/file_manager/background/js/media_import_handler_unittest.js

@@ -26,9 +26,6 @@ var mockCopier;
 /** @type {!MockFileSystem} */
 var destinationFileSystem;
 
-/** @type {!importer.TestDuplicateFinder.Factory} */
-var duplicateFinderFactory;
-
 /** @type {!Promise<!DirectoryEntry>} */
 var destinationFactory;
 
@@ -93,7 +90,6 @@ function setUp() {
   mediaScanner = new TestMediaScanner();
   destinationFileSystem = new MockFileSystem('googleDriveFilesystem');
   destinationFactory = Promise.resolve(destinationFileSystem.root);
-  duplicateFinderFactory = new importer.TestDuplicateFinder.Factory();
   driveSyncHandler = new MockDriveSyncHandler();
 
   mediaImporter = new importer.MediaImportHandler(

ui/file_manager/file_manager/background/js/test_duplicate_finder.js

-// 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.
-
-// Namespace
-var importer = importer || {};
-
-/**
- * A duplicate finder for testing.  Allows the return value to be set.
- * @constructor
- * @implements {importer.DuplicateFinder}
- * @struct
- */
-importer.TestDuplicateFinder = function() {
-  /** @type {boolean} */
-  this.returnValue = false;
-};
-
-/** @override */
-importer.TestDuplicateFinder.prototype.checkDuplicate = function(entry) {
-  return Promise.resolve(this.returnValue);
-};
-
-/** @override */
-importer.TestDuplicateFinder.prototype.getStatistics = function() {
-  return {
-    computeHashTime: 0,
-    searchHashTime: 0
-  };
-};
-
-/**
- * @constructor
- * @implements {importer.DuplicateFinder.Factory}
- */
-importer.TestDuplicateFinder.Factory = function() {
-  /** @private {!Array<!importer.DuplicateFinder>} */
-  this.instances = [];
-};
-
-/** @override */
-importer.TestDuplicateFinder.Factory.prototype.create = function() {
-  var newInstance = new importer.TestDuplicateFinder();
-  this.instances.push(newInstance);
-  return newInstance;
-};