This is a temporary hack for the iPad Pro 12.9" gen2, which has non-functional echo cancellation. Bug: webrtc:8682 Change-Id: I646deeeb4723c4accac6f364c5c76a015791e202 Reviewed-on: https://webrtc-review.googlesource.com/35680 Commit-Queue: Jonathan Yu <yujo@chromium.org> Reviewed-by: Henrik Andreassson <henrika@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21417}