drive: Stop calling OnChangeListLoadComplete() if DirectoryFetchInfo is not empty

Call LoadAfterLoadDirectory() instead.

BUG=333164
TEST=unit_tests

Review URL: https://codereview.chromium.org/132503004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244406 0039d316-1c4b-4281-b951-d872f2087c98
ChangeListLoader::~ChangeListLoader() {
  STLDeleteElements(&fast_fetch_feed_fetcher_set_);
}

ChangeListLoader::~ChangeListLoader() {
  STLDeleteElements(&fast_fetch_feed_fetcher_set_);
}
