Update separator opacity on visibility change

Bug: 904318
Change-Id: I3c0367bc925a5f3b78f3a0457c25ef3b7c807b38
Reviewed-on: https://chromium-review.googlesource.com/c/1333007Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607765}

chrome/browser/ui/views/location_bar/icon_label_bubble_view.cc

@@ -170,6 +170,7 @@ void IconLabelBubbleView::SetLabel(const base::string16& label) {
   SetAccessibleName(label);
   label_->SetText(label);
   separator_view_->SetVisible(ShouldShowSeparator());
+  separator_view_->UpdateOpacity();
 }
 
 void IconLabelBubbleView::SetImage(const gfx::ImageSkia& image_skia) {