Revert "Reporting of decoding_codec_plc events"

This reverts commit 0a88ea050cda58de81d624cf2764d46929447ed5.

Reason for revert: This CL breaks Chromium's FYI bots (example: https://ci.chromium.org/p/chromium/builders/webrtc.fyi/WebRTC%20Chromium%20FYI%20Linux%20Tester/4033).

Original change's description:
> Reporting of decoding_codec_plc events
> 
> Change-Id: Id71b37244bc98bffaf25131a519127b3d2b86a8f
> 
> Bug: webrtc:10838
> Change-Id: Id71b37244bc98bffaf25131a519127b3d2b86a8f
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147263
> Commit-Queue: Alex Narest <alexnarest@google.com>
> Reviewed-by: Magnus Flodman <mflodman@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#28700}

TBR=mflodman@webrtc.org,alexnarest@google.com

Change-Id: I5e5dd29ee375ba422f79932d4b8c3fd028a53db4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:10838
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/147269
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28707}
diff --git a/modules/audio_coding/neteq/neteq_impl.h b/modules/audio_coding/neteq/neteq_impl.h
index c4887a7..9e1af10 100644
--- a/modules/audio_coding/neteq/neteq_impl.h
+++ b/modules/audio_coding/neteq/neteq_impl.h
@@ -64,14 +64,7 @@
 
 class NetEqImpl : public webrtc::NetEq {
  public:
-  enum class OutputType {
-    kNormalSpeech,
-    kPLC,
-    kCNG,
-    kPLCCNG,
-    kVadPassive,
-    kCodecPLC
-  };
+  enum class OutputType { kNormalSpeech, kPLC, kCNG, kPLCCNG, kVadPassive };
 
   enum ErrorCodes {
     kNoError = 0,