[PATCH] D53641: [clangd] Remove didOpen extraFlags extension.

[Sam McCall via Phabricator via cfe-commits]

sammccall added a comment.

BTW I'm holding off submitting this until we decide the fate of https://reviews.llvm.org/D53688.
If we're going to add that extension, I'd like to land the two patches together so the former user of this extension can rely on *one* of them being available.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D53641