When building WebRTC.framework, building the XCTest test runner is a problem because it requires Chromium's //base checkout. This workaround allows to skip that. No-Presubmit: True Bug: webrtc:12134 Change-Id: I0d99bd03f27911f46679ee91b0120e7121d1c7d7 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196081 Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Jeremy Leconte <jleconte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32732}