Revert "Reland "Refactors UlpFec and FlexFec to use a common interface.""

This reverts commit 49734dc0faa69616a58a1a95c7fc61a4610793cf.

Reason for revert: Still something wrong with ulpfec fuzzer setup.

Original change's description:
> Reland "Refactors UlpFec and FlexFec to use a common interface."
> 
> This is a reland of 11af1d7444fd7438766b7bc52cbd64752d72e32e
> 
> Original change's description:
> > Refactors UlpFec and FlexFec to use a common interface.
> >
> > The new VideoFecGenerator is now injected into RtpSenderVideo,
> > and generalizes the usage.
> > This also prepares for being able to genera FEC in the RTP egress
> > module.
> >
> > Bug: webrtc:11340
> > Change-Id: I8aa873129b2fb4131eb3399ee88f6ea2747155a3
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168347
> > Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> > Reviewed-by: Sebastian Jansson <srte@webrtc.org>
> > Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
> > Commit-Queue: Erik Språng <sprang@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#30515}
> 
> Bug: webrtc:11340, chromium:1052323
> Change-Id: Id646047365f1c46cca9e6f3e8eefa5151207b4a0
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168608
> Commit-Queue: Erik Språng <sprang@webrtc.org>
> Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#30593}

TBR=sprang@webrtc.org,stefan@webrtc.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:11340, chromium:1052323
Change-Id: I920ce0a48a08768d7a98a563e2b66bd6eb8602b7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/169121
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30616}

modules/include/module_fec_types.h

@@ -24,9 +24,9 @@ enum FecMaskType {
 
 // Struct containing forward error correction settings.
 struct FecProtectionParams {
-  int fec_rate = 0;
-  int max_fec_frames = 0;
-  FecMaskType fec_mask_type = FecMaskType::kFecMaskRandom;
+  int fec_rate;
+  int max_fec_frames;
+  FecMaskType fec_mask_type;
 };
 
 }  // namespace webrtc