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/acm2/call_statistics.cc b/modules/audio_coding/acm2/call_statistics.cc
index e97e529..a506ead 100644
--- a/modules/audio_coding/acm2/call_statistics.cc
+++ b/modules/audio_coding/acm2/call_statistics.cc
@@ -28,11 +28,7 @@
       break;
     }
     case AudioFrame::kPLC: {
-      ++decoding_stat_.decoded_neteq_plc;
-      break;
-    }
-    case AudioFrame::kCodecPLC: {
-      ++decoding_stat_.decoded_codec_plc;
+      ++decoding_stat_.decoded_plc;
       break;
     }
     case AudioFrame::kCNG: {