[cros] Polishing avatar picker layout.

chrome/browser/resources/chromeos/login/oobe.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.
  *
  * This is the stylesheet used by the Out of the box experience (OOBE) flow,
  * sign in and lock screens.
  */
 
 html,
 body {
@@ skipping 511 matching lines @@
  * .default-image: one of the default images is selected (including the grey
  *                 silhouette);
  * .profile-image: profile image is selected;
  * .profile-image-loading: profile image is being loaded;
  * .online: camera is streaming video;
  * .camera: camera (live or photo) is selected;
  * .live: camera is in live mode (no photo taken yet/last photo removed).
  */
 
 #user-image-preview {
-  border-radius: 4px;
   float: right;
   margin: 4px;
   max-width: 220px;
 }
 
 html[dir=rtl] #user-image-preview {
   float: left;
 }
 
 #user-image-preview-img {
   display: block;
   max-height: 220px;
   max-width: 220px;
 }
 
 html[camera=webrtc] .camera.live #user-image-preview-img {
   display: none;
 }
 
 .default-image #user-image-preview-img {
   background: white;
   border: solid 1px #cacaca;
+  border-radius: 4px;
+  padding: 2px;
 }
 
 .user-image-stream-area {
   display: none;
   padding: 0;
   position: relative;
 }
 
 html[camera=webrtc] .camera.live .user-image-stream-area {
   display: block;
@@ skipping 695 matching lines @@
   width: 100%;
 }
 
 .background-initial {
   opacity: 0;
 }
 
 .background-final {
   opacity: 1;
 }