nisse 7b3ce5b872 Delete FilesystemInterface::CopyFile.
Only use of this method was to implement the cross-device case of
MoveFile on unix systems.

In turn, only use of the MoveFile method is in
FileRotatingStream::RotateFiles. Since file rotation should never
involve any copying of log data, the MoveFile fallback to copying can
be deleted.

BUG=webrtc:6424

Review-Url: https://codereview.webrtc.org/2747373003
Cr-Commit-Position: refs/heads/master@{#17364}
2017-03-23 17:54:16 +00:00
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