change newly added OVERRIDE to override in sync/

sync/internal_api/public/attachments/in_memory_attachment_store.h

Index: sync/internal_api/public/attachments/in_memory_attachment_store.h
diff --git a/sync/internal_api/public/attachments/in_memory_attachment_store.h b/sync/internal_api/public/attachments/in_memory_attachment_store.h
index 06a982bb224a309aa9798bd5d077dbb0e4af903e..adf4035a9173b7c0d9fcd8dc2509d4d8b367e351 100644
--- a/sync/internal_api/public/attachments/in_memory_attachment_store.h
+++ b/sync/internal_api/public/attachments/in_memory_attachment_store.h
@@ -27,11 +27,11 @@ class SYNC_EXPORT InMemoryAttachmentStore : public AttachmentStoreBase,
 
   // AttachmentStoreBase implementation.
   virtual void Read(const AttachmentIdList& ids,
-                    const ReadCallback& callback) OVERRIDE;
+                    const ReadCallback& callback) override;
   virtual void Write(const AttachmentList& attachments,
-                     const WriteCallback& callback) OVERRIDE;
+                     const WriteCallback& callback) override;
   virtual void Drop(const AttachmentIdList& ids,
-                    const DropCallback& callback) OVERRIDE;
+                    const DropCallback& callback) override;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> callback_task_runner_;