Use webrtc::EncodedImageBuffer::Create instead of webrtc::EncodedImage::Allocate

The latter is being deprecated in
https://webrtc-review.googlesource.com/c/src/+/155163

Bug: webrtc:9378
Change-Id: I5356a62fa4f7b7790ff24aab814b647f2a21117f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833466
Auto-Submit: Niels Möller <nisse@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702110}

remoting/protocol/webrtc_dummy_video_encoder.cc

@@ -140,9 +140,8 @@ webrtc::EncodedImageCallback::Result WebrtcDummyVideoEncoder::SendEncodedFrame(
   }
 
   webrtc::EncodedImage encoded_image;
-  encoded_image.Allocate(buffer_size);
-  encoded_image.set_size(buffer_size);
-  memcpy(encoded_image.data(), buffer, buffer_size);
+  encoded_image.SetEncodedData(
+      webrtc::EncodedImageBuffer::Create(buffer, buffer_size));
   encoded_image._encodedWidth = frame.size.width();
   encoded_image._encodedHeight = frame.size.height();
   encoded_image._completeFrame = true;