My advice is to do nothing and just let things remain as they are. In the scheme of things the 299 MB partition takes up a rather trifling amount of disk-space and should cause you no problems in the future. You might just wish to use Disk Management to delete that partition (volume) so that the disk-space remains unallocated.
There's a strong likelihood that third-party partition management programs (and certainly NOT the freely available versions) will not be able to merge that existing partition with the disk's C:\ partition since it is not adjacent to the latter partition. And you can run into serious problems manipulating partitions with these programs. It's just not worth it in your case I would think.