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
void BrowserWindowGtk::RegisterUserPrefs(PrefService* prefs) {
  bool custom_frame_default = false;
  if (ui::XDisplayExists() &&
      !prefs->HasPrefPath(prefs::kUseCustomChromeFrame)) {
    custom_frame_default = GetCustomFramePrefDefault();
  }
  prefs->RegisterBooleanPref(prefs::kUseCustomChromeFrame,
                             custom_frame_default,
                             PrefService::SYNCABLE_PREF);
}

void BrowserWindowGtk::RegisterUserPrefs(PrefService* prefs) {
  bool custom_frame_default = false;
  if (ui::XDisplayExists() &&
      !prefs->HasPrefPath(prefs::kUseCustomChromeFrame)) {
    custom_frame_default = GetCustomFramePrefDefault();
  }
  prefs->RegisterBooleanPref(prefs::kUseCustomChromeFrame,
                             custom_frame_default,
                             PrefService::SYNCABLE_PREF);
}
