Whenever a change is reverted, "Revert" is added and the subject of the
change that is being reverted is copied.
However, if the subject is around 73 characters and the word "Revert" is
added, then the subject will be above 73 characters.
This change checks the length of the subject, and if the subject length
is above 63, it will shorten it to 60 and add "..." in the end. Thus,
the final length will always be below 73.
Change-Id: I07e36ef60f8add83f34f41b01c0d2d41bfc9b448
006d52bb86