In sync setup UI, reset onsubmit handler for sync configuration on load.

chrome/browser/resources/options/sync_setup_overlay.js

Index: chrome/browser/resources/options/sync_setup_overlay.js
diff --git a/chrome/browser/resources/options/sync_setup_overlay.js b/chrome/browser/resources/options/sync_setup_overlay.js
index fb439c46bb415b8a1fa882a462fb13c4dbce2e57..801ea9e29afadd24189ea07ac8476e648f246e27 100644
--- a/chrome/browser/resources/options/sync_setup_overlay.js
+++ b/chrome/browser/resources/options/sync_setup_overlay.js
@@ -58,10 +58,6 @@ cr.define('options', function() {
         self.sendCredentialsAndClose_();
         return false;
       };
-      $('choose-data-types-form').onsubmit = function() {
-        self.sendConfiguration_();
-        return false;
-      };
       $('google-option').onchange = $('explicit-option').onchange = function() {
         self.onPassphraseRadioChanged_();
       };
@@ -375,6 +371,13 @@ cr.define('options', function() {
       this.resetPage_('sync-setup-configure');
       $('sync-setup-configure').hidden = false;
 
+      // onsubmit is changed when submitting a passphrase. Reset it to its
+      // default.
+      $('choose-data-types-form').onsubmit = function() {
+        self.sendConfiguration_();
+        return false;
+      };
+
       if (args) {
         if (!args['encryptionEnabled'])
           $('customize-sync-encryption').hidden = true;