Media Galleries Partial Deprecation: Remove scan functionality.

chrome/test/data/extensions/api_test/media_galleries/cancel_scan/test.js

-// Copyright 2014 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.
-
-var mediaGalleries = chrome.mediaGalleries;
-
-function StartAndCancelMediaScanTest() {
-  function StartMediaScanTest() {
-    var startEventListener = function(details) {
-      chrome.test.assertEq('start', details.type);
-      mediaGalleries.onScanProgress.removeListener(startEventListener);
-      CancelMediaScanTest();
-    }
-    mediaGalleries.onScanProgress.addListener(startEventListener);
-
-    mediaGalleries.startMediaScan();
-  }
-
-  function CancelMediaScanTest() {
-    var cancelEventListener = function(details) {
-      chrome.test.assertEq('cancel', details.type);
-      mediaGalleries.onScanProgress.removeListener(cancelEventListener);
-      chrome.test.succeed();
-    };
-    mediaGalleries.onScanProgress.addListener(cancelEventListener);
-
-    mediaGalleries.cancelMediaScan();
-  }
-
-  StartMediaScanTest();
-}
-
-CreateDummyWindowToPreventSleep();
-
-chrome.test.runTests([
-  StartAndCancelMediaScanTest,
-]);