Chromium has switched to using the r8 dexer from dx, so we need to
switch as well.
Bug: None
Change-Id: I8c7845bd100ad21c6142a35e7f266a2aa37563b0
Reviewed-on: https://webrtc-review.googlesource.com/82062
Commit-Queue: Patrik Höglund <phoglund@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23546}