flags: remove enable-webrtc-srtp-encrypted-headers

Per email discussion, we aren't interested in shipping this feature any time
soon.

Bug: 954201
Change-Id: I28b4701d1f7fd9e56f1ced71d6eb3fb1d886ed57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1572706
Auto-Submit: Elly Fong-Jones <[email protected]>
Commit-Queue: Avi Drissman <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#652534}
5 files changed