One polymer_config.js to rule them all.

R=michaelpg@chromium.org,fukino@chromium.org,mfoltz@chromium.org
BUG=425626

Review URL: https://codereview.chromium.org/1224783005

Cr-Commit-Position: refs/heads/master@{#337882}
void OobeUI::RemoveObserver(Observer* observer) {
  observer_list_.RemoveObserver(observer);
}

void OobeUI::RemoveObserver(Observer* observer) {
  observer_list_.RemoveObserver(observer);
}
