Zhi Huang 5329214838 Revert "Delete Filesystem::TempFilename."
This reverts commit 6de95f06d0512049553f8120547ab78675e3a76a.

Reason for revert: Broke internal projects.
Original change's description:
> Delete Filesystem::TempFilename.
> 
> Also delete a few unused private members of UnixFilesystem.
> 
> Bug: webrtc:6424
> Change-Id: Ib52f2d877690159d197fe767fd04a0d1ade7eb1a
> Reviewed-on: https://webrtc-review.googlesource.com/30301
> Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
> Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#21148}

TBR=deadbeef@webrtc.org,nisse@webrtc.org

Change-Id: I02874f80dbfcafc26dadbb5897e510613801713d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:6424
Reviewed-on: https://webrtc-review.googlesource.com/31160
Reviewed-by: Zhi Huang <zhihuang@webrtc.org>
Commit-Queue: Zhi Huang <zhihuang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21152}
2017-12-08 00:08:30 +00:00
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