RefCounted types should not have public destructors, chrome/browser/ part 2

chrome/browser/sync/glue/history_model_worker.cc

Index: chrome/browser/sync/glue/history_model_worker.cc
diff --git a/chrome/browser/sync/glue/history_model_worker.cc b/chrome/browser/sync/glue/history_model_worker.cc
index 35d459d19c76306fd4bcb8d5dfc808582b57c060..9ad68f164f66eed125b59e9b79740bed885e885f 100644
--- a/chrome/browser/sync/glue/history_model_worker.cc
+++ b/chrome/browser/sync/glue/history_model_worker.cc
@@ -33,6 +33,8 @@ class WorkerTask : public HistoryDBTask {
   virtual void DoneRunOnMainThread() {}
 
  protected:
+  virtual ~WorkerTask() {}
+
   WorkCallback work_;
   WaitableEvent* done_;
   SyncerError* error_;
@@ -44,9 +46,6 @@ HistoryModelWorker::HistoryModelWorker(HistoryService* history_service)
   CHECK(history_service);
 }
 
-HistoryModelWorker::~HistoryModelWorker() {
-}
-
 SyncerError HistoryModelWorker::DoWorkAndWaitUntilDone(
     const WorkCallback& work) {
   WaitableEvent done(false, false);
@@ -61,4 +60,6 @@ ModelSafeGroup HistoryModelWorker::GetModelSafeGroup() {
   return GROUP_HISTORY;
 }
 
+HistoryModelWorker::~HistoryModelWorker() {}
+
 }  // namespace browser_sync