Removed the OK button from the action choice dialog.

chrome/browser/resources/file_manager/js/action_choice.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';
 
 document.addEventListener('DOMContentLoaded', function() {
   ActionChoice.load();
 });
 
@@ skipping 149 matching lines @@
   this.document_.querySelector('.choices').appendChild(this.list_);
 
   var self = this;  // .bind(this) doesn't work on constructors.
   this.list_.itemConstructor = function(item) {
     return self.renderItem(item);
   };
 
   this.list_.selectionModel = new cr.ui.ListSingleSelectionModel();
   this.list_.dataModel = new cr.ui.ArrayDataModel([]);
   this.list_.autoExpands = true;
-  this.list_.activateItemAtIndex = function(index) {
+
+  var acceptActionBound = function() {
     this.acceptAction_();
   }.bind(this);
+  this.list_.activateItemAtIndex = acceptActionBound;
+  this.list_.addEventListener('click', acceptActionBound);
 
   this.previews_ = this.document_.querySelector('.previews');
   this.counter_ = this.document_.querySelector('.counter');
-
-  this.document_.querySelector('button.ok').addEventListener('click',
-      function(event) {
-        this.acceptAction_();
-      }.bind(this));
-
   this.document_.addEventListener('keydown', this.onKeyDown_.bind(this));
 
   metrics.startInterval('PhotoImport.Load');
   this.dom_.setAttribute('loading', '');
 
   util.disableBrowserShortcutKeys(this.document_);
 };
 
 /**
  * Renders the list.
@@ skipping 78 matching lines @@
  * @param {string} source Path to source.
  * @param {function()} callback Completion callback.
  * @private
  */
 ActionChoice.prototype.loadSource_ = function(source, callback) {
   var onTraversed = function(results) {
     metrics.recordInterval('PhotoImport.Scan');
     var videos = results.filter(FileType.isVideo);
     if (videos.length == 1) {
       this.singleVideo_ = videos[0];
-      this.enabledOptions_.push(ActionChoice.Action.PLAY_VIDEO);
+      this.enabledOptions_.push(ActionChoice.Action.WATCH_SINGLE_VIDEO);
       this.watchSingleVideoItem_.title = loadTimeData.getStringF(
           'ACTION_CHOICE_WATCH_SINGLE_VIDEO', videos[0].name);
       this.watchSingleVideoItem_.hidden = false;
       this.renderList_();
     }
 
     var mediaFiles = results.filter(FileType.isImageOrVideo);
     if (mediaFiles.length == 0) {
       // If we have no media files, the only choice is view files. So, don't
       // confuse user with a single choice, and just open file manager.
@@ skipping 103 matching lines @@
   window.close();
 };
 
 /**
  * Keydown event handler.
  * @param {Event} e The event.
  * @private
  */
 ActionChoice.prototype.onKeyDown_ = function(e) {
   switch (util.getKeyModifiers(e) + e.keyCode) {
+    case '13':
+      this.acceptAction_();
+      break;
     case '27':
       this.recordAction_('close');
       this.close_();
-      return;
+      break;
   }
 };
 
 /**
  * Runs an action.
  * @param {ActionChoice.Action} action Action to perform.
  * @private
  */
 ActionChoice.prototype.runAction_ = function(action) {
   switch (action) {
@@ skipping 89 matching lines @@
  */
 ActionChoice.prototype.recordAction_ = function(action) {
   metrics.recordEnum('PhotoImport.Action', action,
       ['import-photos-to-drive',
        'view-files',
        'view-files-auto',
        'watch-single-video',
        'error',
        'close']);
 };