Reset the device policy machinery upon retrying enrollment.

BUG=chromium-os:18208
TEST=See bug description


Review URL: http://codereview.chromium.org/7676005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97615 0039d316-1c4b-4281-b951-d872f2087c98
void BrowserPolicyConnector::RegisterForUserPolicy(
    const std::string& oauth_token) {
  if (user_data_store_.get())
    user_data_store_->SetOAuthToken(oauth_token);
}

void BrowserPolicyConnector::RegisterForUserPolicy(
    const std::string& oauth_token) {
  if (user_data_store_.get())
    user_data_store_->SetOAuthToken(oauth_token);
}
