Previous commits in this bug removed Emacs/Vim modelines from files
under paths listed in tools/rewriting/ThirdPartyPaths.txt, which we
should not touch. Restore the modelines on the files that still need
it; the remaining ones were already restored by upstream resyncs.
Reverts the relevant hunks from:
e1fe74e9e3 - gfx/ (12 of 140 files still affected)
6be5ec2fff - toolkit/ (45 files)
074b376055 - devtools/ (10 files)
d2b4f9d727 - js/ (3 files)
0804530f25 - ipc/ (2 files)
63d9534ed5 - other-licenses/ (1 file)
50cd0384b0 - media/ (1 file)
55481ac4b5 - layout/ (1 file)
05e870a9a8 - testing/ (1 file)
Differential Revision: https://phabricator.services.mozilla.com/D295578
Sylvestre Ledru
1fc8709cd5