Reason for revert: Downstream project now fixed. Original issue's description: > Revert of Reduce dependencies on rtc::FileSystem in FileRotatingStream tests, adding helpers in webrtc::test:: (patchset #7 id:120001 of https://codereview.webrtc.org/2872283002/ ) > > Reason for revert: > Fails to compile successfully. > > > Original issue's description: > > Reduce dependencies on rtc::FileSystem in FileRotatingStream tests. > > > > Use webrtc::test::OutputPath instead of Filesystem::GetAppTempFolder. > > Added functions RemoveFile and RemoveDir in the webrtc::test namespace, > > to replace use of Filesystem::DeleteFolderAndContents. > > > > This makes Filesystem::DeleteFolderAndContents unused, to be deleted > > together with related code in a followup cl. > > > > BUG=webrtc:7345 > > > > Review-Url: https://codereview.webrtc.org/2872283002 > > Cr-Commit-Position: refs/heads/master@{#18173} > > Committed:dd7b5f32b5> > TBR=pthatcher@webrtc.org,kjellander@webrtc.org,tommi@webrtc.org,nisse@webrtc.org > # Skipping CQ checks because original CL landed less than 1 days ago. > NOPRESUBMIT=true > NOTREECHECKS=true > NOTRY=true > BUG=webrtc:7345 > > Review-Url: https://codereview.webrtc.org/2885393002 > Cr-Commit-Position: refs/heads/master@{#18180} > Committed:deaa33d2f5TBR=pthatcher@webrtc.org,kjellander@webrtc.org,tommi@webrtc.org,ehmaldonado@webrtc.org # Not skipping CQ checks because original CL landed more than 1 days ago. BUG=webrtc:7345 Review-Url: https://codereview.webrtc.org/2885413002 Cr-Commit-Position: refs/heads/master@{#18193}