Add gallery browser tests to delete an image in the slide mode.

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

 // Copyright (c) 2013 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.
 
 // Browser test for basic Chrome OS file manager functionality:
 //  - The file list is updated when a file is added externally to the Downloads
 //    folder.
 //  - Selecting a file and copy-pasting it with the keyboard copies the file.
 //  - Selecting a file and pressing delete deletes it.
 
@@ skipping 1301 matching lines @@
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, TraverseSlideImagesOnDrive) {
   AddScript("gallery/slide_mode.js");
   set_test_case_name("traverseSlideImagesOnDrive");
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, RenameImageOnDownloads) {
-  AddScript("gallery/test_util.js");
   AddScript("gallery/slide_mode.js");
   set_test_case_name("renameImageOnDownloads");
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(GalleryBrowserTestInGuestMode,
                        RenameImageOnDownloads) {
-  AddScript("gallery/test_util.js");
   AddScript("gallery/slide_mode.js");
   set_test_case_name("renameImageOnDownloads");
   StartTest();
 }
 
 IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, RenameImageOnDrive) {
-  AddScript("gallery/test_util.js");
   AddScript("gallery/slide_mode.js");
   set_test_case_name("renameImageOnDrive");
   StartTest();
 }
 
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, DeleteImageOnDownloads) {
+  AddScript("gallery/slide_mode.js");
+  set_test_case_name("deleteImageOnDownloads");
+  StartTest();
+}
+
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTestInGuestMode,
+                       DeleteImageOnDownloads) {
+  AddScript("gallery/slide_mode.js");
+  set_test_case_name("deleteImageOnDownloads");
+  StartTest();
+}
+
+IN_PROC_BROWSER_TEST_F(GalleryBrowserTest, DeleteImageOnDrive) {
+  AddScript("gallery/slide_mode.js");
+  set_test_case_name("deleteImageOnDrive");
+  StartTest();
+}
+
 }  // namespace
 }  // namespace file_manager