Disable token handle fetching on some devices

chrome/browser/chromeos/login/existing_user_controller.cc

Index: chrome/browser/chromeos/login/existing_user_controller.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index 54a6820cbac13b39200f5b28d2bd910d0a33ada9..9a0cc9ac40ce312ce0f91cf4d4e1fd451ac5d440 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -1236,7 +1236,7 @@ void ExistingUserController::OnOAuth2TokensFetched(
     OnAuthFailure(AuthFailure(AuthFailure::FAILED_TO_INITIALIZE_TOKEN));
     return;
   }
-  if (StartupUtils::IsWebviewSigninEnabled()) {
+  if (StartupUtils::IsWebviewSigninEnabled() && TokenHandlesEnabled()) {
     if (!token_handle_util_.get()) {
       token_handle_util_.reset(
           new TokenHandleUtil(user_manager::UserManager::Get()));
@@ -1260,4 +1260,14 @@ void ExistingUserController::OnTokenHandleObtained(
   }
 }
 
+bool ExistingUserController::TokenHandlesEnabled() {

[Nikita (slow), 2015/05/13 08:34:52]

I suggest having static function in TokenHandleUtil instead as this code doesn't
really belong in ExistingUserController.

+  bool ephemeral_users_enabled = false;
+  bool show_names_on_signin = true;
+  cros_settings_->GetBoolean(kAccountsPrefEphemeralUsersEnabled,
+                             &ephemeral_users_enabled);
+  cros_settings_->GetBoolean(kAccountsPrefShowUserNamesOnSignIn,
+                             &show_names_on_signin);
+  return show_names_on_signin && !ephemeral_users_enabled;
+}
+
 }  // namespace chromeos