Remove backwards compatibilty header for Optional

Remove backwards compatibilty header for Optional

BUG=webrtc:8205
Review-Url: https://codereview.webrtc.org/3011963002
Cr-Commit-Position: refs/heads/master@{#19906}
Committed: https://webrtc.googlesource.com/src/+/feeb9bfe033daf9976819081a191f63d5d5f5346

[kwiberg-webrtc, 2017-09-06 08:58:24]

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

[commit-bot: I haz the power, 2017-09-06 08:58:29]

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, 2017-09-06 09:45:19]

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

[commit-bot: I haz the power, 2017-09-06 09:45:20]

Dry run: This issue passed the CQ dry run.

[kwiberg-webrtc, 2017-09-06 10:33:32]

kwiberg@webrtc.org changed reviewers:
+ mbonadei@webrtc.org

[kwiberg-webrtc, 2017-09-06 10:33:33]

Obviously, I need to post a deprecation notice before landing this.

[mbonadei, 2017-09-06 11:11:44]

On 2017/09/06 10:33:33, kwiberg-webrtc wrote:
> Obviously, I need to post a deprecation notice before landing this.

I see that you've already posted the deprecation notice. lgtm.

[kwiberg-webrtc, 2017-09-18 08:38:35]

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

[commit-bot: I haz the power, 2017-09-18 08:38:45]

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, 2017-09-18 09:43:15]

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

[commit-bot: I haz the power, 2017-09-18 09:43:15]

Dry run: This issue passed the CQ dry run.

[kwiberg-webrtc, 2017-09-20 18:48:46]

The CQ bit was checked by kwiberg@webrtc.org

[kwiberg-webrtc, 2017-09-20 18:48:46]

The patchset sent to the CQ was uploaded after l-g-t-m from mbonadei@webrtc.org
Link to the patchset: https://codereview.webrtc.org/3011963002/#ps40001 (title:
"rebase")

[commit-bot: I haz the power, 2017-09-20 18:48:50]

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, 2017-09-20 19:17:44]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1505933326083870,
"parent_rev": "851481cfaadfd758119396e6403aaefb13be6d7d", "commit_rev":
"feeb9bfe033daf9976819081a191f63d5d5f5346"}

[commit-bot: I haz the power, 2017-09-20 19:17:48]

Description was changed from

==========
Remove backwards compatibilty header for Optional

BUG=webrtc:8205
==========

to

==========
Remove backwards compatibilty header for Optional

BUG=webrtc:8205

Review-Url: https://codereview.webrtc.org/3011963002
Cr-Commit-Position: refs/heads/master@{#19906}
Committed:
https://webrtc.googlesource.com/src/+/feeb9bfe033daf9976819081a191f63d5d5f5346
==========

[commit-bot: I haz the power, 2017-09-20 19:17:49]

Committed patchset #3 (id:40001) as
https://webrtc.googlesource.com/src/+/feeb9bfe033daf9976819081a191f63d5d5f5346