[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 SyncBackendHost::HandleConnectionStatusChangeOnFrontendLoop(
    sync_api::ConnectionStatus status) {
  if (!frontend_)
    return;

  DCHECK_EQ(MessageLoop::current(), frontend_loop_);

  frontend_->OnConnectionStatusChange(status);
}

void SyncBackendHost::HandleConnectionStatusChangeOnFrontendLoop(
    sync_api::ConnectionStatus status) {
  if (!frontend_)
    return;

  DCHECK_EQ(MessageLoop::current(), frontend_loop_);

  frontend_->OnConnectionStatusChange(status);
}
