Fix closure compiler error which is caused by crrev.com/1165913003.

BUG=488227
TEST=GYP_GENERATORS=ninja tools/gyp/gyp --depth . ui/file_manager/gallery/js/compiled_resources.gyp && ninja -C out/Default

Review URL: https://codereview.chromium.org/1151503006

Cr-Commit-Position: refs/heads/master@{#332821}

ui/file_manager/gallery/js/gallery.js

@@ -17,8 +17,7 @@ ContentMetadataProvider.WORKER_SCRIPT = '/js/metadata_worker.js';
  */
 function Gallery(volumeManager) {
   /**
-   * @type {{appWindow: chrome.app.window.AppWindow, onClose: function(),
-   *     onMaximize: function(), onMinimize: function(),
+   * @type {{appWindow: chrome.app.window.AppWindow,
    *     onAppRegionChanged: function(), readonlyDirName: string,
    *     displayStringFunction: function(), loadTimeData: Object,
    *     curDirEntry: Entry, searchResults: *}}