Causes page corruption.
* Revert "Restore error message for when comment is deleted while replying"
This reverts commit 655c0526d6.
* Revert "Use transcluded from API to avoid ever fetching Parsoid DOM in client"
This reverts commit 9d0fc184fe.
* Revert "Create a 'transcludedfrom' API endpoint"
This reverts commit 5d8f3b9051.
* Revert "Edit API for replies"
This reverts commit 8829a1a412.
Bug: T259855
Change-Id: I98036f14dd900b51f20e98696e31b9b618eceee1