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

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

Index: ui/file_manager/file_manager/foreground/js/import_controller_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/import_controller_unittest.js b/ui/file_manager/file_manager/foreground/js/import_controller_unittest.js
index b7d716497a9543d2795a823a4db526543885fa08..8d98efbcdb5caff9494aa27e51d09e945b2ac26e 100644
--- a/ui/file_manager/file_manager/foreground/js/import_controller_unittest.js
+++ b/ui/file_manager/file_manager/foreground/js/import_controller_unittest.js
@@ -483,6 +483,9 @@ importer.TestCommandWidget = function() {
   /** @public {function()} */
   this.executeListener;
 
+  /** @public {function()} */
+  this.destinationListener;
+
   /** @private {!importer.Resolver.<!importer.CommandUpdate>} */
   this.updateResolver_ = new importer.Resolver();
 
@@ -503,6 +506,12 @@ importer.TestCommandWidget.prototype.addImportClickedListener =
 };
 
 /** @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);