ChromeOS GAIA: Fixed size for close and back buttons on signin and enrollment screens

chrome/browser/resources/chromeos/login/screen_gaia_signin.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.
  */
 
 #gaia-signin {
   height: 609px; /* Should be the same as #user-image.loading min-heigth. */
   padding: 70px 17px 69px;    /* Screen has no controls. */
   width: 722px; /* Should be the same as #user-image.loading width. */
 }
@@ skipping 51 matching lines @@
   #signin-right {
     font-size: 14px;
   }
 }
 
 .new-gaia-flow #signin-right,
 .no-right-panel #signin-right {
   display: none;
 }
 
-#close-button-item {
+.custom-gaia-button {
   background: transparent none;
-  background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON);
   background-position: center;
   background-repeat: no-repeat;
-  height: 14px;
+  height: 34px;
   position: absolute;
-  right: 15px;
-  top: 15px;
-  width: 14px;
+  top: 0;
+  width: 34px;
   z-index: 1;
 }
 
+#close-button-item {
+  background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON);
+  right: 0;
+}
+
 html[dir=rtl] #close-button-item {
-  left: 15px;
+  left: 0;
   right: auto;
 }
 
 .loading #close-button-item,
 .new-gaia-flow .full-width #close-button-item {
   background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON_ON_WHITE);
 }
 
 .loading.auth-completed #close-button-item {
   display: none;
 }
 
 #close-button-item:disabled {
   background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON_MASKED);
 }
 
 #close-button-item:hover {
   cursor: pointer;
 }
 
 #back-button-item {
-  background: transparent none;
   background-image: url(chrome://theme/IDR_LOGIN_BACK_BUTTTON);
-  background-position: center;
-  background-repeat: no-repeat;
-  height: 18px;
-  left: 14px;
-  position: absolute;
-  top: 14px;
-  width: 18px;
-  z-index: 1;
+  left: 0;
 }
 
 html[dir=rtl] #back-button-item {
   -webkit-transform: scaleX(-1);
   left: auto;
-  right: 14px;
+  right: 0;
 }
 
 .new-gaia-flow .full-width #back-button-item {
   display: none;
 }
 
 #back-button-item:disabled {
   background-image: url(chrome://theme/IDR_LOGIN_BACK_BUTTTON_MASKED);
 }
 
@@ skipping 181 matching lines @@
 
 html /deep/ #forgotPasswordDlg {
   position: fixed;
   top: 200px;
   width: 350px;
 }
 
 html /deep/ #forgotPasswordDlg gaia-paper-button[autofocus] {
   color: rgb(66, 133, 244);
 }