[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::Core::DeleteSyncDataFolder() {
  DCHECK_EQ(MessageLoop::current(), sync_loop_);
  if (file_util::DirectoryExists(sync_data_folder_path_)) {
    if (!file_util::Delete(sync_data_folder_path_, true))
      SLOG(DFATAL) << "Could not delete the Sync Data folder.";
  }
}

void SyncBackendHost::Core::DeleteSyncDataFolder() {
  DCHECK_EQ(MessageLoop::current(), sync_loop_);
  if (file_util::DirectoryExists(sync_data_folder_path_)) {
    if (!file_util::Delete(sync_data_folder_path_, true))
      SLOG(DFATAL) << "Could not delete the Sync Data folder.";
  }
}
