Our encoding for the hrefs like "./Foo" that we send to Parsoid
differed slightly from how Parsoid outputs them, so to avoid dirty
diffs, we had to store the original ones we received from Parsoid
and send them back if they were unchanged.
Change the encoding to match Parsoid's exactly (by referring to the
Parsoid source code), and then remove 'rawTitle'/'origTitle'.
On a historical note, 'rawTitle'/'origTitle' were originally added to
fix other issues with links, which I hope are long behind us:
* bb45d984ca (T145978)
* fda2e6c1b5 (T44140)
Follow-up to 362df66b47, which removed
some other old stuff from the handling of Parsoid links.
Bug: T325766
Change-Id: I0ad0a655380eb2fb29b5ac01e2e399ac550ce34a