Update import details panel to comply (mostly) with UX direction.

ui/file_manager/file_manager/foreground/js/import_controller_unittest.js

 // Copyright 2014 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.
 
 /** @type {!MockVolumeManager} */
 var volumeManager;
 
 /** @type {!TestMediaScanner} */
 var mediaScanner;
 
@@ skipping 465 matching lines @@
  * Test implementation of importer.CommandWidget.
  *
  * @constructor
  * @implements {importer.CommandWidget}
  * @struct
  */
 importer.TestCommandWidget = function() {
   /** @public {function()} */
   this.executeListener;
 
+  /** @public {function()} */
+  this.destinationListener;
+
   /** @private {!importer.Resolver.<!importer.CommandUpdate>} */
   this.updateResolver_ = new importer.Resolver();
 
   /** @public {!importer.Resolver.<!importer.CommandUpdate>} */
   this.updatePromise = this.updateResolver_.promise;
 };
 
 /** Resets the widget */
 importer.TestCommandWidget.prototype.resetPromise = function() {
   this.updateResolver_ = new importer.Resolver();
   this.updatePromise = this.updateResolver_.promise;
 };
 
 /** @override */
 importer.TestCommandWidget.prototype.addImportClickedListener =
     function(listener) {
   this.executeListener = listener;
 };
 
 /** @override */
+importer.TestCommandWidget.prototype.addDestinationClickedListener =
+    function(listener) {
+  this.destinationListener = listener;
+};
+
+/** @override */
 importer.TestCommandWidget.prototype.update = function(update) {
   assertFalse(this.updateResolver_.settled, 'Should not have been settled.');
   this.updateResolver_.resolve(update);
 };
 
 /** @override */
 importer.TestCommandWidget.prototype.updateDetails = function(scan) {
   // TODO(smckay)
 };
 
@@ skipping 43 matching lines @@
  * @param {!Array.<string>} fileNames
  * @return {!VolumeInfo}
  */
 function setupFileSystem(volumeType, volumeId, fileNames) {
   var volumeInfo = volumeManager.createVolumeInfo(
       volumeType, volumeId, 'A volume known as ' + volumeId);
   assertTrue(volumeInfo != null);
   volumeInfo.fileSystem.populate(fileNames);
   return volumeInfo;
 }