views: don't try to throb bookmark buttons

chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc

Index: chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
diff --git a/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc b/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
index 19322017b9431b157f5212995e02ea066450bfbb..48931a8cda4f6685593700d02a44c0d4bee15407 100644
--- a/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
+++ b/chrome/browser/ui/views/bookmarks/bookmark_bar_view.cc
@@ -1993,7 +1993,9 @@ void BookmarkBarView::StartThrobbing(const BookmarkNode* node,
       // Node is hidden, animate the overflow button.
       throbbing_view_ = overflow_button_;
     } else if (!overflow_only) {
-      throbbing_view_ = static_cast<CustomButton*>(child_at(index));
+      // Regular BookmarkButtons do not have a throb animation, and telling them
+      // to throb causes spurious repaints.
+      throbbing_view_ = nullptr;
     }
   } else if (bookmarks::IsDescendantOf(node, managed_->managed_node())) {
     throbbing_view_ = managed_bookmarks_button_;