[Sync] Add cookie jar mismatch logging

sync/internal_api/public/test/fake_sync_manager.h

Index: sync/internal_api/public/test/fake_sync_manager.h
diff --git a/sync/internal_api/public/test/fake_sync_manager.h b/sync/internal_api/public/test/fake_sync_manager.h
index 4443a2a9620f720083eeec2c5418c3bec24f3661..9bdde3f4e8f12bceeb9994cafdda6e2fa6451841 100644
--- a/sync/internal_api/public/test/fake_sync_manager.h
+++ b/sync/internal_api/public/test/fake_sync_manager.h
@@ -116,6 +116,7 @@ class FakeSyncManager : public SyncManager {
       syncer::TypeDebugInfoObserver* observer) override;
   void RequestEmitDebugInfo() override;
   void ClearServerData(const ClearServerDataCallback& callback) override;
+  void OnCookieJarChanged(bool account_mismatch) override;
 
  private:
   scoped_refptr<base::SequencedTaskRunner> sync_task_runner_;