Reset sync setup dialog to initial state when it is opened.

chrome/browser/resources/options/sync_setup_overlay.css

Index: chrome/browser/resources/options/sync_setup_overlay.css
diff --git a/chrome/browser/resources/options/sync_setup_overlay.css b/chrome/browser/resources/options/sync_setup_overlay.css
index ee3cc29a35ab292604d988f5b4be7dde667552d1..96f2fdc0b46e52e1cdf7db3d9185a96a756ebb9b 100644
--- a/chrome/browser/resources/options/sync_setup_overlay.css
+++ b/chrome/browser/resources/options/sync_setup_overlay.css
@@ -103,13 +103,11 @@
 }
 
 #email-readonly {
-  display: none;
   font-weight: bold;
 }
 
 #sync-setup-overlay * div.errormsg {
   color: red;
-  display: none;
   font-size: smaller;
 }
 
@@ -219,10 +217,6 @@ div.error-msg-spacer {
   padding: 2px;
 }
 
-.access-code-row {
-  display: none;
-}
-
 .access-code-row > td {
   padding-bottom: 1px;
   text-align: center;
@@ -232,14 +226,6 @@ div.error-msg-spacer {
   padding-top: 6px;
 }
 
-#error-custom {
-  display: none;
-}
-
-#captcha-div {
-  display: none;
-}
-
 #captcha-instructions {
   margin-bottom: 5px;
   white-space: normal;