This check was important when header bytes were copied from source
packet to destination, but current implementation (new line 123) slices
the source packet, making capacity of the destination packet irrelevant.
Bug: b/189015462
Change-Id: I7e649cb7dfc6ba0fbe989c943e6515ab0da05fef
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219695
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34110}
02c0295a98