[cros] Error bubble on login is displayed to the left of Gaia frame.

chrome/browser/resources/chromeos/login/header_bar.js

Index: chrome/browser/resources/chromeos/login/header_bar.js
diff --git a/chrome/browser/resources/chromeos/login/header_bar.js b/chrome/browser/resources/chromeos/login/header_bar.js
index 871bdd04c5245c580a13dc8b8a494300f87c70de..7de92d41c219f4f9b7ab387f770bf3a6a8e09bc9 100644
--- a/chrome/browser/resources/chromeos/login/header_bar.js
+++ b/chrome/browser/resources/chromeos/login/header_bar.js
@@ -90,8 +90,10 @@ cr.define('login', function() {
     if (state != NET_STATE.OFFLINE) {
       Oobe.showSigninUI();
     } else {
-      $('bubble').showTextForElement($('add-user-button'),
-          localStrings.getString('addUserErrorMessage'));
+      $('bubble').showTextForElement(
+          $('add-user-button'),
+          localStrings.getString('addUserErrorMessage'),
+          cr.ui.Bubble.Attachment.BOTTOM);
       chrome.send('loginAddNetworkStateObserver',
                   ['login.HeaderBar.bubbleWatchdog']);
     }