Move common account picker/user pod js/css/html out of src/chrome

ui/login/oobe.css

 /* Copyright 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.
  *
  * This is the stylesheet used by the Out of the box experience (OOBE) flow,
  * sign in and lock screens.
  */
 
 html,
 body {
@@ skipping 37 matching lines @@
 
 button:not(.custom-appearance) {
   min-width: 72px !important;
 }
 
 button.button-fancy {
   min-width: 72px !important;
 }
 
 button.button-blue {
-  background-image: -webkit-linear-gradient(rgb(93, 154, 255),
-                                            rgb(93, 154, 255) 38%,
-                                            rgb(88, 145, 240));
+  background-image: linear-gradient(rgb(93, 154, 255),
+                                    rgb(93, 154, 255) 38%,
+                                    rgb(88, 145, 240));
   border: 1px solid rgba(45, 102, 195, 1);
   border-radius: 2px;
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.15), inset 0 1px 2px
               rgba(255, 255, 255, 0.4);
   color: #fff;
   font-size: 14px;
   margin: 0 1px 0 0;
   min-height: 2em;
   min-width: 4em;
   text-shadow: 0 1px 0 rgba(0, 0, 0, 0.5);
 }
 
 
 button.button-blue:hover {
-  background-image: -webkit-linear-gradient(rgb(101, 158, 253),
-                                            rgb(101, 158, 253) 38%,
-                                            rgb(96, 151, 241));
+  background-image: linear-gradient(rgb(101, 158, 253),
+                                    rgb(101, 158, 253) 38%,
+                                    rgb(96, 151, 241));
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25), inset 0 1px 2px
               rgba(255, 255, 255, 0.4);
 }
 
 button.button-blue:active {
-  background-image: -webkit-linear-gradient(rgb(96, 149, 237),
-                                            rgb(96, 149, 237) 38%,
-                                            rgb(96, 149, 237));
+  background-image: linear-gradient(rgb(96, 149, 237),
+                                    rgb(96, 149, 237) 38%,
+                                    rgb(96, 149, 237));
   border: 1px solid rgba(38, 84, 160, 1);
   box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.1);
 }
 
 button.button-red {
-  background-image: -webkit-linear-gradient(rgb(221, 75, 57),
-                                            rgb(221, 75, 57) 38%,
-                                            rgb(197, 66, 49));
+  background-image: linear-gradient(rgb(221, 75, 57),
+                                    rgb(221, 75, 57) 38%,
+                                    rgb(197, 66, 49));
   border: 1px solid rgba(167, 57, 44, 1);
   border-radius: 2px;
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.15), inset 0 1px 2px
       rgba(255, 255, 255, 0.4);
   color: #fff;
   margin: 0 1px 0 0;
   min-height: 2em;
   min-width: 4em;
   text-shadow: 0 1px 0 rgba(0, 0, 0, 0.15);
 }
 
 button.button-red:hover {
-  background-image: -webkit-linear-gradient(rgb(231, 78, 59),
-                                            rgb(231, 78, 59) 38%,
-                                            rgb(209, 70, 52));
+  background-image: linear-gradient(rgb(231, 78, 59),
+                                    rgb(231, 78, 59) 38%,
+                                    rgb(209, 70, 52));
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.25), inset 0 1px 2px
       rgba(255, 255, 255, 0.4);
 }
 
 button.button-red:active {
   box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
 }
 
 .label,
 .flexible-label {
@@ skipping 17 matching lines @@
   box-shadow: 0 5px 80px #505050;
   min-height: 250px;
   position: relative;
   width: 460px;
   z-index: 10;
 }
 
 #installation-settings-popup h1 {
   -webkit-padding-end: 24px;
   -webkit-user-select: none;
-  background: -webkit-linear-gradient(white, #F8F8F8);
+  background: linear-gradient(white, #F8F8F8);
   color: rgb(83, 99, 125);
   font-size: 105%;
   font-weight: bold;
   margin: 0;
   padding: 10px 15px 8px 15px;
   text-shadow: white 0 1px 2px;
 }
 
 .popup-content-area {
   padding: 0 20px 60px 20px;
@@ skipping 79 matching lines @@
 
 @-webkit-keyframes throbber-animation {
   from {
     background-position: 0;
   }
   to {
     background-position: -576px;
   }
 }