Simplify directory initialization in Files app.

chrome/browser/resources/file_manager/foreground/js/photo/gallery.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * Called from the main frame when unloading.
  * @return {string?} User-visible message on null if it is OK to close.
  */
@@ skipping 641 matching lines @@
     // If the Gallery was opened on search results the search query will not be
     // recorded in the app state and the relaunch will just open the gallery
     // in the curDirEntry directory.
     path = this.context_.curDirEntry.fullPath;
     window.top.document.title = this.context_.curDirEntry.name;
     displayName =
         this.displayStringFunction_('GALLERY_ITEMS_SELECTED',
                                     selectedItems.length);
   }
 
-  window.top.util.updateAppState(path,
+  window.top.util.updateAppState(
+      null,  // Keep the current directory.
+      path,  // Update the selection.
       {gallery: (this.currentMode_ === this.mosaicMode_ ? 'mosaic' : 'slide')});
 
   // We can't rename files in readonly directory.
   // We can only rename a single file.
   this.filenameEdit_.disabled = selectedItems.length !== 1 ||
                                 this.context_.readonlyDirName;
 
   this.filenameEdit_.value = displayName;
 
   // Resolve real filesystem path of the current file.
@@ skipping 193 matching lines @@
  */
 Gallery.prototype.updateButtons_ = function() {
   if (this.modeButton_) {
     var oppositeMode =
         this.currentMode_ === this.slideMode_ ? this.mosaicMode_ :
                                                 this.slideMode_;
     this.modeButton_.title =
         this.displayStringFunction_(oppositeMode.getTitle());
   }
 };