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 AllDownloadsCompleteObserver::OnDownloadCreated(
    DownloadManager* manager, DownloadItem* item) {
  if (pre_download_ids_.find(item->GetId()) == pre_download_ids_.end() &&
      item->GetState() == DownloadItem::IN_PROGRESS) {
    item->AddObserver(this);
    pending_downloads_.insert(item);
  }
}

void AllDownloadsCompleteObserver::OnDownloadCreated(
    DownloadManager* manager, DownloadItem* item) {
  if (pre_download_ids_.find(item->GetId()) == pre_download_ids_.end() &&
      item->GetState() == DownloadItem::IN_PROGRESS) {
    item->AddObserver(this);
    pending_downloads_.insert(item);
  }
}
