Use display_email() for Uber Tray messages.

BUG=124087
TEST=manually

Review URL: https://chromiumcodereview.appspot.com/10388171

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137721 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/system/ash_system_tray_delegate.cc

@@ -242,7 +242,7 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   }
 
   virtual const std::string GetUserEmail() const OVERRIDE {
-    return UserManager::Get()->GetLoggedInUser().email();
+    return UserManager::Get()->GetLoggedInUser().display_email();
   }
 
   virtual const SkBitmap& GetUserImage() const OVERRIDE {