Bug 1612440 - Don't implement Serialize/Deserialize in some parts of th API. r=gw
Bug 1612440 - Don't implement Serialize/Deserialize in some parts of th API. r=gw

Now that the capture code is gone, we don't use these serde implementations. They get in the way of changing the way transactions are represented so I'd like to remove a bunch of them for now.

Differential Revision: https://phabricator.services.mozilla.com/D71604

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/a307cb281ea1ac328796b23650d010d53084205a

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender