Make |context| passed to queryRequiredElement optional

ui/file_manager/file_manager/foreground/js/file_manager.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.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 461 matching lines @@
         this.directoryModel_,
         this.commandHandler);
     this.toolbarController_ = new ToolbarController(
         this.ui_.toolbar,
         this.ui_.dialogNavigationList,
         this.ui_.listContainer,
         assert(this.ui_.locationLine),
         this.selectionHandler_,
         this.directoryModel_);
     this.tooltipController_ = new TooltipController(
-        queryRequiredElement(this.dialogDom_, '#tooltip'),
+        queryRequiredElement('#tooltip', this.dialogDom_),
         Array.prototype.slice.call(
             this.dialogDom_.querySelectorAll('[has-tooltip]')));
     this.emptyFolderController_ = new EmptyFolderController(
         this.ui_.emptyFolder,
         this.directoryModel_);
 
     if (this.dialogType === DialogType.FULL_PAGE) {
       importer.importEnabled().then(
           function(enabled) {
             if (enabled) {
@@ skipping 286 matching lines @@
     assert(this.dialogDom_);
     assert(this.metadataModel_);
 
     // Cache nodes we'll be manipulating.
     var dom = this.dialogDom_;
     assert(dom);
 
     // Initialize the dialog.
     FileManagerDialogBase.setFileManager(this);
 
-    var table = queryRequiredElement(dom, '.detail-table');
+    var table = queryRequiredElement('.detail-table', dom);
     FileTable.decorate(
         table,
         this.metadataModel_,
         this.volumeManager_,
         this.historyLoader_,
         this.dialogType == DialogType.FULL_PAGE);
-    var grid = queryRequiredElement(dom, '.thumbnail-grid');
+    var grid = queryRequiredElement('.thumbnail-grid', dom);
     FileGrid.decorate(
         grid,
         this.metadataModel_,
         this.volumeManager_,
         this.historyLoader_);
 
     this.addHistoryObserver_();
 
     this.ui_.initAdditionalUI(
         assertInstanceof(table, FileTable),
         assertInstanceof(grid, FileGrid),
         new LocationLine(
-            queryRequiredElement(dom, '#location-breadcrumbs'),
+            queryRequiredElement('#location-breadcrumbs', dom),
             this.volumeManager_));
 
     // Handle UI events.
     this.backgroundPage_.background.progressCenter.addPanel(
         this.ui_.progressCenterPanel);
 
     util.addIsFocusedMethod();
 
     // Populate the static localized strings.
     i18nTemplate.process(this.document_, loadTimeData);
@@ skipping 544 matching lines @@
   FileManager.prototype.debugMe = function() {
     var out = 'Debug information.\n';
 
     out += '1. VolumeManagerWrapper\n' +
         this.volumeManager_.toString() + '\n';
 
     out += 'End of debug information.';
     console.log(out);
   };
 })();