Reland "Delete the non-const version of the EncodedImage::data() method."

This is a reland of f2969fa868f4913583e79f74ceced5cc6b7d6b7d

Original change's description:
> Delete the non-const version of the EncodedImage::data() method.
>
> Bug: webrtc:9378
> Change-Id: I84ace3ca6a2eb4d0f7c3d4e62f815d77df581bfa
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185122
> Reviewed-by: Artem Titov <titovartem@webrtc.org>
> Reviewed-by: Philip Eliasson <philipel@webrtc.org>
> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
> Commit-Queue: Niels Moller <nisse@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#32197}

Bug: webrtc:9378
Change-Id: I8521ac567749ea547f91cf7549eb48966baffa11
Tbr: ilnik@webrtc.org
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185807
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Marina Ciocea <marinaciocea@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32209}
diff --git a/modules/video_coding/frame_object.cc b/modules/video_coding/frame_object.cc
index bdb43f7..d58aa10 100644
--- a/modules/video_coding/frame_object.cc
+++ b/modules/video_coding/frame_object.cc
@@ -38,7 +38,8 @@
     const absl::optional<webrtc::ColorSpace>& color_space,
     RtpPacketInfos packet_infos,
     rtc::scoped_refptr<EncodedImageBuffer> image_buffer)
-    : first_seq_num_(first_seq_num),
+    : image_buffer_(image_buffer),
+      first_seq_num_(first_seq_num),
       last_seq_num_(last_seq_num),
       last_packet_received_time_(last_packet_received_time),
       times_nacked_(times_nacked) {
@@ -60,7 +61,7 @@
   // as of the first packet's.
   SetPlayoutDelay(rtp_video_header_.playout_delay);
 
-  SetEncodedData(std::move(image_buffer));
+  SetEncodedData(image_buffer_);
   _encodedWidth = rtp_video_header_.width;
   _encodedHeight = rtp_video_header_.height;