Hide icons in message center on lock screen

ui/message_center/views/message_center_view.cc

Index: ui/message_center/views/message_center_view.cc
diff --git a/ui/message_center/views/message_center_view.cc b/ui/message_center/views/message_center_view.cc
index a16898da43f1dc6817a89d8bbdfed964e2eecdb8..c033dab68063491bfc63959690352a36c63887f7 100644
--- a/ui/message_center/views/message_center_view.cc
+++ b/ui/message_center/views/message_center_view.cc
@@ -621,9 +621,13 @@ void MessageCenterView::UpdateButtonBarStatus() {
   }
 
   button_bar_->SetBackArrowVisible(mode_ == Mode::SETTINGS);
-  button_bar_->SetSettingsAndQuietModeButtonsEnabled(!is_locked_);
+  button_bar_->SetButtonsVisible(!is_locked_);
   button_bar_->SetTitle(GetButtonBarTitle());
 
+  // Skips the followings if the screen is locked and the buttons are hidden.
+  if (is_locked_)

[dewittj, 2017/01/12 18:29:57]

nit: This seems somewwhat fragile to future updates as-is, perhaps you could do
a small helper function like:

if (!is_locked_)
  EnableCloseAllIfAppropriate();

then the early return would not be necessary.

+    return;
+
   if (mode_ == Mode::NOTIFICATIONS) {
     bool no_closable_views = true;
     for (const auto& view : notification_views_) {