Gaia loading screen changed to align with new Sync screen UI.

chrome/browser/resources/chromeos/login/screen_gaia_signin.css

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.css
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
index 96a7f37273d4ebc1eb5e2ba9b4c94383d3468c75..f8491e8b462ae605d6b1a8843db491fcf0bcec4a 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.css
@@ -18,6 +18,18 @@
   width: 522px;
 }
 
+.new-gaia-flow .throbber {
+  display: none;
+}
+
+throbber-notice {
+  display: none;
+}
+
+.new-gaia-flow throbber-notice {
+  display: block;
+}
+
 #gaia-signin.full-width {
   padding: 75px 0 0;
 }
@@ -69,6 +81,10 @@ html[dir=rtl] #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);
 }