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. Crash when deleting via context menu. This was happening because
  BookmarkMenuDelegate didn't keep a handle to the menu item it added
  the items to.
. If other bookmarks folder is empty it wouldn't show a menu item for
  (empty).
. Deleting the last item in the other folder would prematurely close
  the menu.
. Hit DCHECK when adding empty menu (long standing issue).

BUG=83746
TEST=from the wrench menu on windows right click a bookmark, delete
     it, and make sure you don't crash.
R=ben@chromium.org

Review URL: http://codereview.chromium.org/7066034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86634 0039d316-1c4b-4281-b951-d872f2087c98