[Sync] Cleanup all tab sync enabling logic now that its on by default.

BUG=none
TEST=


Review URL: https://chromiumcodereview.appspot.com/10443046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139462 0039d316-1c4b-4281-b951-d872f2087c98
void ProfileSyncService::OnSyncConfigureRetry() {
  if (!auto_start_enabled_ && !backend_initialized_) {
    OnUnrecoverableError(FROM_HERE,
                         "Configure failed to download.");
  }

  NotifyObservers();
}

void ProfileSyncService::OnSyncConfigureRetry() {
  if (!auto_start_enabled_ && !backend_initialized_) {
    OnUnrecoverableError(FROM_HERE,
                         "Configure failed to download.");
  }

  NotifyObservers();
}
