Delete unused method FilesystemInterface::GetFileTime.

Delete unused method FilesystemInterface::GetFileTime.

BUG=webrtc:6424
Review-Url: https://codereview.webrtc.org/2926713007
Cr-Commit-Position: refs/heads/master@{#18564}
Committed: https://chromium.googlesource.com/external/webrtc/+/a65ad229390742d08f2843140a7f992e3af0356f

[nisse-webrtc, 2017-06-09 13:24:17]

nisse@webrtc.org changed reviewers:
+ deadbeef@webrtc.org

[nisse-webrtc, 2017-06-09 13:24:18]

PTAL. I do these deletions as separate cls, so they can be tested and possibly
reverted independently.

[Taylor Brandstetter, 2017-06-09 21:33:47]

lgtm

[nisse-webrtc, 2017-06-13 11:07:23]

The CQ bit was checked by nisse@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-13 11:07:31]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-06-13 11:36:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-13 11:36:26]

Dry run: This issue passed the CQ dry run.

[nisse-webrtc, 2017-06-13 12:35:39]

The CQ bit was checked by nisse@webrtc.org

[nisse-webrtc, 2017-06-13 12:35:40]

The patchset sent to the CQ was uploaded after l-g-t-m from deadbeef@webrtc.org
Link to the patchset: https://codereview.webrtc.org/2926713007/#ps20001 (title:
"Rebased.")

[commit-bot: I haz the power, 2017-06-13 12:35:43]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-06-13 12:37:44]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1497357339543340,
"parent_rev": "8c6afef9544c264dcc9bcfd07aa2a71c4175248a", "commit_rev":
"a65ad229390742d08f2843140a7f992e3af0356f"}

[commit-bot: I haz the power, 2017-06-13 12:37:51]

Description was changed from

==========
Delete unused method FilesystemInterface::GetFileTime.

BUG=webrtc:6424
==========

to

==========
Delete unused method FilesystemInterface::GetFileTime.

BUG=webrtc:6424

Review-Url: https://codereview.webrtc.org/2926713007
Cr-Commit-Position: refs/heads/master@{#18564}
Committed:
https://chromium.googlesource.com/external/webrtc/+/a65ad229390742d08f2843140...
==========

[commit-bot: I haz the power, 2017-06-13 12:37:53]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/webrtc/+/a65ad229390742d08f2843140...