[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::Initialize() {
  InitSettings();

  ClearStaleErrors();

  sync_prefs_.AddSyncPrefObserver(this);

  if (IsManaged()) {
    DisableForUser();
    return;
  }

  RegisterAuthNotifications();

  if (!HasSyncSetupCompleted() || signin_->GetAuthenticatedUsername().empty()) {
    DisableForUser();
  }

  TryStart();
}

void ProfileSyncService::Initialize() {
  InitSettings();

  ClearStaleErrors();

  sync_prefs_.AddSyncPrefObserver(this);

  if (IsManaged()) {
    DisableForUser();
    return;
  }

  RegisterAuthNotifications();

  if (!HasSyncSetupCompleted() || signin_->GetAuthenticatedUsername().empty()) {
    DisableForUser();
  }

  TryStart();
}
