diff --git a/api/frame_transformer_interface.h b/api/frame_transformer_interface.h
index 753c7f4..2cfe6ed 100644
--- a/api/frame_transformer_interface.h
+++ b/api/frame_transformer_interface.h
@@ -50,14 +50,7 @@
   // webrtc::RtpDescriptorAuthentication is exposed in api/.
   virtual std::vector<uint8_t> GetAdditionalData() const = 0;
 
-  // TODO(bugs.webrtc.org/11380) make pure virtual after implementating it
-  // downstream.
-  virtual const VideoFrameMetadata& GetMetadata() const { return metadata_; }
-
- private:
-  // TODO(bugs.webrtc.org/11380) remove from interface once GetRtpVideoHeader is
-  // pure virtual.
-  VideoFrameMetadata metadata_;
+  virtual const VideoFrameMetadata& GetMetadata() const = 0;
 };
 
 // Extends the TransformableFrameInterface to expose audio-specific information.