Roll WebRTC from e8080f4a4332 to 70efbb839b30 (1 revision)

https://webrtc.googlesource.com/src.git/+log/e8080f4a4332..70efbb839b30

2021-04-23 linderborg@webrtc.org Enhance the readability of the style guide.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/webrtc-chromium-autoroll
Please CC webrtc-chromium-sheriffs-robots@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: None
Tbr: webrtc-chromium-sheriffs-robots@google.com
Change-Id: Ie5503cf012f9882f4c3ff0a9b5ad68fa69eb8069
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2848930
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#875931}