Media Galleries Partial Deprecation: Remove scan functionality.

chrome/test/data/extensions/api_test/media_galleries/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 MediaScanTest() {
-  var scanProgress = 'start';
-  var initialGalleryCount = 0;
-
-  function OnScanResultsAdded(galleries) {
-    chrome.test.assertEq(initialGalleryCount + 1, galleries.length);
-    chrome.test.succeed();
-  }
-
-  function OnScanProgress(details) {
-    chrome.test.assertEq(scanProgress, details.type);
-    if (scanProgress == 'start') {
-      scanProgress = 'finish';
-    } else {
-      scanProgress = 'done';
-      chrome.test.runWithUserGesture(function() {
-          mediaGalleries.addScanResults(OnScanResultsAdded);
-      });
-    }
-  }
-
-  function OnInitialMediaGalleries(galleries) {
-    initialGalleryCount = galleries.length;
-    mediaGalleries.onScanProgress.addListener(OnScanProgress);
-    mediaGalleries.startMediaScan();
-  }
-
-  mediaGalleries.getMediaFileSystems(OnInitialMediaGalleries);
-}
-
-CreateDummyWindowToPreventSleep();
-
-chrome.test.runTests([
-  MediaScanTest,
-]);