Gallery: Remove position: absolute; line for redo button.

ui/file_manager/gallery/css/gallery.css

 /* Copyright (c) 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. */
 
 body {
   -webkit-user-select: none;
   font-size: 84%;
   margin: 0;
 }
 
@@ skipping 674 matching lines @@
 .gallery > .toolbar button.undo[pressed] {
   background-image: -webkit-image-set(
       url(../images/100/icon_undo_selected.png) 1x,
       url(../images/200/icon_undo_selected.png) 2x);
 }
 
 .gallery > .toolbar button.redo {
   background-image: -webkit-image-set(
       url(../images/100/icon_redo.png) 1x,
       url(../images/200/icon_redo.png) 2x);
-  position: absolute;  /* Exclude from center-packing*/
 }
 
 .gallery > .toolbar button.redo:active,
 .gallery > .toolbar button.redo[pressed] {
   background-image: -webkit-image-set(
       url(../images/100/icon_redo_selected.png) 1x,
       url(../images/200/icon_redo_selected.png) 2x);
 }
 
 .gallery > .toolbar button[disabled],
@@ skipping 651 matching lines @@
   background-color: rgba(255, 0, 0, 0.3);
 }
 
 .debug-me .load-target-external-metadata::before {
   background-color: rgba(0, 255, 0, 0.3);
 }
 
 .debug-me .load-target-file-entry::before {
   background-color: rgba(0, 0, 255, 0.3);
 }