Also delete the base class MemoryStreamBase. Bug: webrtc:6424 Change-Id: I7eec40ecff17c7c65fdf55882bccb2abaf1d5d84 Reviewed-on: https://webrtc-review.googlesource.com/c/108622 Commit-Queue: Niels Moller <nisse@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#25494}