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
int TabStripGtk::GetTabHOffset(int tab_index) {
  if (tab_index < GetTabCount() && GetTabAt(tab_index - 1)->mini() &&
      !GetTabAt(tab_index)->mini()) {
    return mini_to_non_mini_gap_ + kTabHOffset;
  }
  return kTabHOffset;
}

int TabStripGtk::GetTabHOffset(int tab_index) {
  if (tab_index < GetTabCount() && GetTabAt(tab_index - 1)->mini() &&
      !GetTabAt(tab_index)->mini()) {
    return mini_to_non_mini_gap_ + kTabHOffset;
  }
  return kTabHOffset;
}
