Delete unused copy constructors for VCMEncodedFrame and VCMFrameBuffer.

Bug: webrtc:9378
Change-Id: I742c7e2ca11f9c12d65add2bac9d7d19e09e3f14
Reviewed-on: https://webrtc-review.googlesource.com/85367
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23744}
diff --git a/modules/video_coding/encoded_frame.h b/modules/video_coding/encoded_frame.h
index 17c61d7..252dea4 100644
--- a/modules/video_coding/encoded_frame.h
+++ b/modules/video_coding/encoded_frame.h
@@ -24,8 +24,7 @@
 class VCMEncodedFrame : protected EncodedImage {
  public:
   VCMEncodedFrame();
-  explicit VCMEncodedFrame(const webrtc::EncodedImage& rhs);
-  VCMEncodedFrame(const VCMEncodedFrame& rhs);
+  VCMEncodedFrame(const VCMEncodedFrame&) = delete;
 
   ~VCMEncodedFrame();
   /**