Simplify directory initialization in Files app.

chrome/browser/resources/file_manager/foreground/js/file_tasks.js

Index: chrome/browser/resources/file_manager/foreground/js/file_tasks.js
diff --git a/chrome/browser/resources/file_manager/foreground/js/file_tasks.js b/chrome/browser/resources/file_manager/foreground/js/file_tasks.js
index 506446146cb488a15f19e52965fd156e429df8db..1be3d031b632dc788f88d4e93e498364c4b13dad 100644
--- a/chrome/browser/resources/file_manager/foreground/js/file_tasks.js
+++ b/chrome/browser/resources/file_manager/foreground/js/file_tasks.js
@@ -626,10 +626,14 @@ FileTasks.prototype.openGalleryInternal_ = function(entries) {
 
   if (this.params_ && this.params_.gallery) {
     // Remove the Gallery state from the location, we do not need it any more.
-    util.updateAppState(null /* keep path */, '' /* remove search. */);
+    // TODO(mtomasz): Consider keeping the selection path.
+    util.updateAppState(
+        null, /* keep current directory */
+        '', /* remove current selection */
+        '' /* remove search. */);
   }
 
-  var savedAppState = window.appState;
+  var savedAppState = JSON.parse(JSON.stringify(window.appState));
   var savedTitle = document.title;
 
   // Push a temporary state which will be replaced every time the selection