Set read only display name as primary in fragment not view (DN 2/2)

Also, don't remove the display name from the editor input
field when checking for pending changes, instead just
skip the name mime type after detmining that the read only
display name was used and that it didn't change.

Bug 21956248
Bug 25314004

Change-Id: I9da8430206a721a52b8dad19e5eb235cb9e57fb3