Remove details panel.

ui/file_manager/file_manager/foreground/js/app_state_controller.js

Index: ui/file_manager/file_manager/foreground/js/app_state_controller.js
diff --git a/ui/file_manager/file_manager/foreground/js/app_state_controller.js b/ui/file_manager/file_manager/foreground/js/app_state_controller.js
index 7df9810eba2d0b0bfd8e69e610503aec4d73912d..5bcb4f3217f305f60de7839fe0026887a1057602 100644
--- a/ui/file_manager/file_manager/foreground/js/app_state_controller.js
+++ b/ui/file_manager/file_manager/foreground/js/app_state_controller.js
@@ -79,7 +79,6 @@ AppStateController.prototype.initialize = function(ui, directoryModel) {
   // Restore preferences.
   this.ui_.setCurrentListType(
       this.viewOptions_.listType || ListContainer.ListType.DETAIL);
-  this.ui_.setDetailsVisibility(!!this.viewOptions_.detailsVisibility);
   this.directoryModel_.getFileList().sort(
       this.viewOptions_.sortField || 'modificationTime',
       this.viewOptions_.sortDirection || 'desc');
@@ -99,11 +98,6 @@ AppStateController.prototype.saveViewOptions = function() {
     sortDirection: sortStatus.direction,
     columnConfig: {},
     listType: this.ui_.listContainer.currentListType,
-    /**
-     * TODO(ryoh): Simplify this line after we finally implement details panel.
-     */
-    detailsVisibility: this.ui_.detailsContainer &&
-        this.ui_.detailsContainer.visible || false
   };
   var cm = this.ui_.listContainer.table.columnModel;
   prefs.columnConfig = cm.exportColumnConfig();