Update the position of autocomplete list after the model is updated.

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.
 
 'use strict';
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
@@ skipping 3531 matching lines @@
     if (!this.isOnDrive())
       return;
 
     // Remember the most recent query. If there is an other request in progress,
     // then it's result will be discarded and it will call a new request for
     // this query.
     this.lastAutocompleteQuery_ = query;
     if (this.autocompleteSuggestionsBusy_)
       return;
 
-    // The autocomplete list should be resized and repositioned here as the
-    // search box is resized when it's focused.
-    this.autocompleteList_.syncWidthAndPositionToInput();
-
     if (!query) {
       this.autocompleteList_.suggestions = [];
       return;
     }
 
     var headerItem = {isHeaderItem: true, searchQuery: query};
     if (!this.autocompleteList_.dataModel ||
         this.autocompleteList_.dataModel.length == 0)
       this.autocompleteList_.suggestions = [headerItem];
     else
       // Updates only the head item to prevent a flickering on typing.
       this.autocompleteList_.dataModel.splice(0, 1, headerItem);
 
+    // The autocomplete list should be resized and repositioned here as the
+    // search box is resized when it's focused.
+    this.autocompleteList_.syncWidthAndPositionToInput();
+
     this.autocompleteSuggestionsBusy_ = true;
 
     var searchParams = {
       'query': query,
       'types': 'ALL',
       'maxResults': 4
     };
     chrome.fileBrowserPrivate.searchDriveMetadata(
       searchParams,
       function(suggestions) {
@@ skipping 180 matching lines @@
       callback(this.preferences_);
       return;
     }
 
     chrome.fileBrowserPrivate.getPreferences(function(prefs) {
       this.preferences_ = prefs;
       callback(prefs);
     }.bind(this));
   };
 })();