Attempt at fixing crash. I believe this is happening during session...

chrome/browser/views/bookmark_bar_view.cc

Index: chrome/browser/views/bookmark_bar_view.cc
===================================================================
--- chrome/browser/views/bookmark_bar_view.cc	(revision 1736)
+++ chrome/browser/views/bookmark_bar_view.cc	(working copy)
@@ -1118,7 +1118,6 @@
   SetContextMenuController(this);
 
   size_animation_.reset(new SlideAnimation(this));
-  size_animation_->SetSlideDuration(4000);
 }
 
 MenuButton* BookmarkBarView::CreateOtherBookmarkedButton() {
@@ -1166,6 +1165,17 @@
   SchedulePaint();
 }
 
+void BookmarkBarView::BookmarkModelBeingDeleted(BookmarkBarModel* model) {
+  // The bookmark model should never be deleted before us. This code exists
+  // to check for regressions in shutdown code and not crash.
+  NOTREACHED();
+
+  // Do minimal cleanup, presumably we'll be deleted shortly.
+  NotifyModelChanged();
+  model_->RemoveObserver(this);
+  model_ = NULL;
+}
+
 void BookmarkBarView::BookmarkNodeMoved(BookmarkBarModel* model,
                                         BookmarkBarNode* old_parent,
                                         int old_index,