--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -1617,16 +1617,24 @@ MediaDecoder::RequestDebugInfo()
       return DebugInfoPromise::CreateAndResolve(result, __func__);
     },
     [str] () {
       return DebugInfoPromise::CreateAndResolve(str, __func__);
     });
 }
 
 void
+MediaDecoder::GetMozDebugReaderData(nsACString& aString)
+{
+  if (mReader) {
+    mReader->GetMozDebugReaderData(aString);
+  }
+}
+
+void
 MediaDecoder::NotifyAudibleStateChanged()
 {
   MOZ_DIAGNOSTIC_ASSERT(!IsShutdown());
   GetOwner()->SetAudibleState(mIsAudioDataAudible);
 }
 
 MediaMemoryTracker::MediaMemoryTracker()
 {

--- a/dom/media/MediaDecoder.h
+++ b/dom/media/MediaDecoder.h
@@ -401,17 +401,17 @@ private:
   virtual MediaDecoderOwner::NextFrameStatus NextFrameStatus()
   {
     return mNextFrameStatus;
   }
   virtual MediaDecoderOwner::NextFrameStatus NextFrameBufferedStatus();
 
   // Returns a string describing the state of the media player internal
   // data. Used for debugging purposes.
-  virtual void GetMozDebugReaderData(nsACString& aString) { }
+  virtual void GetMozDebugReaderData(nsACString& aString);
 
   virtual void DumpDebugInfo();
 
   using DebugInfoPromise = MozPromise<nsCString, bool, true>;
   RefPtr<DebugInfoPromise> RequestDebugInfo();
 
 protected:
   virtual ~MediaDecoder();

--- a/dom/media/fmp4/MP4Decoder.cpp
+++ b/dom/media/fmp4/MP4Decoder.cpp
@@ -273,17 +273,9 @@ MP4Decoder::IsVideoAccelerated(layers::K
              taskQueue->BeginShutdown();
              taskQueue->AwaitShutdownAndIdle();
              promise->MaybeResolve(NS_LITERAL_STRING("No; Failed to initialize H264 decoder"));
            });
 
   return promise.forget();
 }
 
-void
-MP4Decoder::GetMozDebugReaderData(nsACString& aString)
-{
-  if (mReader) {
-    mReader->GetMozDebugReaderData(aString);
-  }
-}
-
 } // namespace mozilla

--- a/dom/media/fmp4/MP4Decoder.h
+++ b/dom/media/fmp4/MP4Decoder.h
@@ -37,18 +37,16 @@ public:
   static bool IsAAC(const nsACString& aMimeType);
 
   // Returns true if the MP4 backend is preffed on.
   static bool IsEnabled();
 
   static already_AddRefed<dom::Promise>
   IsVideoAccelerated(layers::KnowsCompositor* aKnowsCompositor, nsIGlobalObject* aParent);
 
-  void GetMozDebugReaderData(nsACString& aString) override;
-
 private:
   ChannelMediaDecoder* CloneImpl(MediaDecoderInit& aInit) override
   {
     if (!IsEnabled()) {
       return nullptr;
     }
     return new MP4Decoder(aInit);
   }

--- a/dom/media/webm/WebMDecoder.cpp
+++ b/dom/media/webm/WebMDecoder.cpp
@@ -53,18 +53,10 @@ WebMDecoder::IsSupportedType(const Media
     }
 #endif
     // Some unsupported codec.
     return false;
   }
   return true;
 }
 
-void
-WebMDecoder::GetMozDebugReaderData(nsACString& aString)
-{
-  if (mReader) {
-    mReader->GetMozDebugReaderData(aString);
-  }
-}
-
 } // namespace mozilla
 

--- a/dom/media/webm/WebMDecoder.h
+++ b/dom/media/webm/WebMDecoder.h
@@ -20,18 +20,16 @@ public:
   {
   }
 
   // Returns true if aContainerType is a WebM type that we think we can render
   // with an enabled platform decoder backend.
   // If provided, codecs are checked for support.
   static bool IsSupportedType(const MediaContainerType& aContainerType);
 
-  void GetMozDebugReaderData(nsACString& aString) override;
-
 private:
   ChannelMediaDecoder* CloneImpl(MediaDecoderInit& aInit) override
   {
     if (!IsWebMEnabled()) {
       return nullptr;
     }
     return new WebMDecoder(aInit);
   }