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

chrome/browser/views/bookmark_bar_view.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/views/bookmark_bar_view.h"
 
 #include <limits>
 
 #include "base/base_drag_source.h"
 #include "base/gfx/skia_utils.h"
@@ skipping 1100 matching lines @@
 
   instructions_ = new ChromeViews::Label(
       l10n_util::GetString(IDS_BOOKMARKS_NO_ITEMS),
       rb.GetFont(ResourceBundle::BaseFont));
   instructions_->SetColor(kInstructionsColor);
   AddChildView(instructions_);
 
   SetContextMenuController(this);
 
   size_animation_.reset(new SlideAnimation(this));
-  size_animation_->SetSlideDuration(4000);
 }
 
 MenuButton* BookmarkBarView::CreateOtherBookmarkedButton() {
   MenuButton* button = new MenuButton(
       l10n_util::GetString(IDS_BOOMARK_BAR_OTHER_BOOKMARKED), this, false);
   button->SetIcon(GetGroupIcon());
   button->SetContextMenuController(this);
   return button;
 }
 
@@ skipping 27 matching lines @@
   BookmarkBarNode* node = model_->GetBookmarkBarNode();
   DCHECK(node && model_->other_node());
   // Create a button for each of the children on the bookmark bar.
   for (int i = 0; i < node->GetChildCount(); ++i)
     AddChildView(i, CreateBookmarkButton(node->GetChild(i)));
   other_bookmarked_button_->SetEnabled(true);
   Layout();
   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,
                                         BookmarkBarNode* new_parent,
                                         int new_index) {
   StopThrobbing(true);
   BookmarkNodeRemovedImpl(model, old_parent, old_index);
   BookmarkNodeAddedImpl(model, new_parent, new_index);
   StartThrobbing();
 }
@@ skipping 645 matching lines @@
 
 void BookmarkBarView::StopThrobbing(bool immediate) {
   if (!throbbing_view_)
     return;
 
   // If not immediate, cycle through 2 more complete cycles.
   throbbing_view_->StartThrobbing(immediate ? 0 : 4);
   throbbing_view_ = NULL;
 }