[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::OnSyncCycleCompleted() {
  UpdateLastSyncedTime();
  if (GetSessionModelAssociator()) {
    MessageLoop::current()->PostTask(FROM_HERE,
        base::Bind(&browser_sync::SessionModelAssociator::DeleteStaleSessions,
                   GetSessionModelAssociator()->AsWeakPtr()));
  }
  DVLOG(2) << "Notifying observers sync cycle completed";
  NotifyObservers();
}

void ProfileSyncService::OnSyncCycleCompleted() {
  UpdateLastSyncedTime();
  if (GetSessionModelAssociator()) {
    MessageLoop::current()->PostTask(FROM_HERE,
        base::Bind(&browser_sync::SessionModelAssociator::DeleteStaleSessions,
                   GetSessionModelAssociator()->AsWeakPtr()));
  }
  DVLOG(2) << "Notifying observers sync cycle completed";
  NotifyObservers();
}
