When comparing emails in the one click signin helper, use the existing utility

chrome/browser/ui/sync/one_click_signin_helper.cc

Index: chrome/browser/ui/sync/one_click_signin_helper.cc
diff --git a/chrome/browser/ui/sync/one_click_signin_helper.cc b/chrome/browser/ui/sync/one_click_signin_helper.cc
index 59fc87c678ae878306ee373281f2b81215e00769..9f2546ed13ef51aea7b4d2d355323f56424fc234 100644
--- a/chrome/browser/ui/sync/one_click_signin_helper.cc
+++ b/chrome/browser/ui/sync/one_click_signin_helper.cc
@@ -1184,7 +1184,7 @@ void OneClickSigninHelper::DidStopLoading(
       std::string last_email =
           profile->GetPrefs()->GetString(prefs::kGoogleServicesLastUsername);
 
-      if (!last_email.empty() && last_email != email_) {
+      if (!gaia::AreEmailsSame(last_email, email_)) {

[bcwhite, 2013/06/03 20:26:30]

I believe you still need to exclude empty addresses.  We don't want two empty
strings to be considered the same email.

[Roger Tawa OOO till Jul 10th, 2013/06/04 14:01:25]

Good catch!  Fixed.

         // If the new email address is different from the email address that
         // just signed in, show a confirmation dialog.