This is a partial revert of https://codereview.webrtc.org/2533213005, deleting rtc::File methods accepting an rtc::Pathname argument. Bug: webrtc:6424 Change-Id: Ib16bdc7294dbddfa12ba9ae206c024ff97e529a4 Reviewed-on: https://webrtc-review.googlesource.com/80180 Commit-Queue: Niels Moller <nisse@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23489}