Gallery: Remove CSS hover zoom in the mosaic view of Gallery.app.

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-family: Open Sans, Droid Sans Fallback, sans-serif;
   font-size: 84%;
   margin: 0;
 }
@@ skipping 1210 matching lines @@
   position: absolute;
   right: 4px;
   top: 4px;
 }
 
 /* Selected and hover state are only visible when zoom transition is over. */
 .mosaic[visible='normal'] .mosaic-tile[selected] .img-border {
   outline-color: rgb(51, 153, 255);
 }
 
-.mosaic[visible='normal'].hover-visible .mosaic-tile:hover {
-  -webkit-transform: scale(1.05);
-  z-index: 50;
-}
-
 .mosaic[visible='normal'].hover-visible
     .mosaic-tile:hover:not([selected]) .img-border {
   outline-color: rgb(182, 212, 252);
 }
 
 .mosaic-tile .img-wrapper {
   bottom: 0;
   left: 0;
   position: absolute;
   right: 0;
@@ skipping 109 matching lines @@
       url(chrome://resources/images/2x/apps/topbar_button_maximize.png) 2x)
       center;
 }
 
 .gallery > .header > .close-button {
   background: -webkit-image-set(
       url(chrome://resources/images/apps/topbar_button_close.png) 1x,
       url(chrome://resources/images/2x/apps/topbar_button_close.png) 2x)
       center;
 }