Don't touch the pasteboard when the browser may be shutting down...

chrome/browser/cocoa/bookmark_bar_controller.mm

 // Copyright (c) 2009 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.
 
 #import "chrome/browser/cocoa/bookmark_bar_controller.h"
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "base/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
@@ skipping 1615 matching lines @@
 - (void)setNodeForBarMenu {
   const BookmarkNode* node = bookmarkModel_->GetBookmarkBarNode();
   BookmarkMenu* menu = static_cast<BookmarkMenu*>([[self view] menu]);
 
   // Make sure types are compatible
   DCHECK(sizeof(long long) == sizeof(int64));
   [menu setRepresentedObject:[NSNumber numberWithLongLong:node->id()]];
 }
 
 - (void)beingDeleted:(BookmarkModel*)model {
-  [self clearBookmarkBar];
+  // The browser may be being torn down; little is safe to do.  As an
+  // example, it may not be safe to clear the pasteboard.
+  // http://crbug.com/38665
 }
 
 // TODO(jrg): for now this is brute force.
 - (void)nodeMoved:(BookmarkModel*)model
         oldParent:(const BookmarkNode*)oldParent oldIndex:(int)oldIndex
         newParent:(const BookmarkNode*)newParent newIndex:(int)newIndex {
   [self loaded:model];
 }
 
 // TODO(jrg): for now this is brute force.
@@ skipping 264 matching lines @@
     [pboard addTypes:[NSArray arrayWithObject:kBookmarkButtonDragType]
                owner:nil];
     [pboard setData:[NSData dataWithBytes:&button length:sizeof(button)]
             forType:kBookmarkButtonDragType];
   } else {
     NOTREACHED();
   }
 }
 
 @end