Bump to version 42.
Bump to version 42.

R=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/40739004

Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8401}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 97aaf68fedc42b7e6b8e5a28d7ae9f4bb11324bd

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