Remove TabContents from TabStripModelObserver::TabDetachedAt.

BUG=107201
TEST=no visible change


Review URL: https://chromiumcodereview.appspot.com/11293205

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167122 0039d316-1c4b-4281-b951-d872f2087c98
gfx::Image* TabStripGtk::GetDropArrowImage(bool is_down) {
  return &ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
      is_down ? IDR_TAB_DROP_DOWN : IDR_TAB_DROP_UP);
}

gfx::Image* TabStripGtk::GetDropArrowImage(bool is_down) {
  return &ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
      is_down ? IDR_TAB_DROP_DOWN : IDR_TAB_DROP_UP);
}
