Revert of Deprecate VCMPacketizationCallback::SendData and use EncodedImageCallback instead. (patchset #5 id:80001 of https://codereview.webrtc.org/1897233002/ )

Reason for revert:
API changes broke downstream.

Original issue's description:
> Deprecate VCMPacketizationCallback::SendData and use EncodedImageCallback instead.
> EncodedImageCallback is used by all encoder implementations and seems to be what we should try to use in the transport.
> EncodedImageCallback can of course be cleaned up in the future.
>
> This moves creation of RTPVideoHeader from the GenericEncoder to the PayLoadRouter.
>
> BUG=webrtc::5687
>
> Committed: https://crrev.com/f5d55aaecdc39e9cc66eb6e87614f04afe28f6eb
> Cr-Commit-Position: refs/heads/master@{#12436}

TBR=stefan@webrtc.org,pbos@webrtc.org,perkj@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc::5687

Review URL: https://codereview.webrtc.org/1903193002

Cr-Commit-Position: refs/heads/master@{#12441}

webrtc/modules/video_coding/include/video_coding_defines.h

@@ -57,11 +57,13 @@ struct VCMFrameCount {
 };
 
 // Callback class used for sending data ready to be packetized
-// Deprecated.
-// TODO(perkj): Remove once OnEncoderImplementationName is not used.
 class VCMPacketizationCallback {
  public:
-  // TODO(perkj): Refactor this. It does not belong in VCMPacketizationCallback.
+  virtual int32_t SendData(uint8_t payloadType,
+                           const EncodedImage& encoded_image,
+                           const RTPFragmentationHeader* fragmentationHeader,
+                           const RTPVideoHeader* rtpVideoHdr) = 0;
+
   virtual void OnEncoderImplementationName(const char* implementation_name) {}
 
  protected: