Fix visibility of flip icon for camera images

chrome/browser/resources/options/chromeos/change_picture_options.css

 /* Copyright (c) 2012 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. */
 
 #user-images-area {
   display: -webkit-box;
 }
 
 #user-image-grid {
   -webkit-user-drag: none;
@@ skipping 115 matching lines @@
   position: absolute;
   top: 50%;
   width: 44px;
 }
 
 .camera.live:not(.online) .user-image-stream-area .spinner {
   display: block;
 }
 
 #flip-photo {
-  -webkit-transition: opacity 75ms linear;
   background: url(chrome://theme/IDR_MIRROR_FLIP) no-repeat;
   border: none;
   bottom: 44px;  /* 8px + image bottom. */
   display: block;
   height: 32px;
-  opacity: 0;
   position: absolute;
   right: 8px;
   width: 32px;
 }
 
-/* TODO(merkulova): remove when webkit crbug.com/126479 is fixed. */
-.flip-trick {
-  -webkit-transform: translateZ(1px);
-}
-
 html[dir=rtl] #flip-photo {
   left: 8px;
   right: auto;
 }
 
-/* "Flip photo" button is hidden during flip animation. */
-.camera.online:not(.animation) #flip-photo,
-.camera:not(.live):not(.animation) #flip-photo {
-  opacity: 0.75;
-}
-
 #discard-photo,
 #take-photo {
   display: none;
   height: 25px;
   margin: 4px;
   padding: 0;
   width: 220px;
 }
 
 .camera:not(.live) #discard-photo {
   background: url(chrome://theme/IDR_USER_IMAGE_RECYCLE)
       no-repeat center center;
   display: block;
 }
 
 .camera.live.online #take-photo {
   background: url(chrome://theme/IDR_USER_IMAGE_CAPTURE)
       no-repeat center -1px;
   display: block;
 }
 
 #user-image-attribution {
   -webkit-padding-start: 34px;
   line-height: 26px;
 }
 
 #user-image-author-website {
   -webkit-padding-start: 5px;
 }