Update android build instruction for webrtc unity plugin.

Update android build instruction for webrtc unity plugin.

BUG=webrtc:8067
Review-Url: https://codereview.webrtc.org/2993423002
Cr-Commit-Position: refs/heads/master@{#19313}
Committed: https://chromium.googlesource.com/external/webrtc/+/3abb73819948535d13beeb654453ade6bc5ffec3

[GeorgeZ, 2017-08-10 23:00:11]

Description was changed from

==========
Update android build instruction for webrtc unity plugin.

BUG=webrtc:8067
==========

to

==========
Update android build instruction for webrtc unity plugin.

BUG=webrtc:8067
==========

[GeorgeZ, 2017-08-10 23:00:11]

gyzhou@chromium.org changed reviewers:
+ qiangchen@chromium.org

[qiangchen, 2017-08-10 23:03:43]

lgtm

[GeorgeZ, 2017-08-10 23:06:26]

The CQ bit was checked by gyzhou@chromium.org

[commit-bot: I haz the power, 2017-08-10 23:06:31]

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, 2017-08-10 23:31:23]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1502406386970270,
"parent_rev": "4d46a5e1e7a86d80fed0a18b9a0a8e95e47b08cf", "commit_rev":
"3abb73819948535d13beeb654453ade6bc5ffec3"}

[commit-bot: I haz the power, 2017-08-10 23:31:28]

Description was changed from

==========
Update android build instruction for webrtc unity plugin.

BUG=webrtc:8067
==========

to

==========
Update android build instruction for webrtc unity plugin.

BUG=webrtc:8067

Review-Url: https://codereview.webrtc.org/2993423002
Cr-Commit-Position: refs/heads/master@{#19313}
Committed:
https://chromium.googlesource.com/external/webrtc/+/3abb73819948535d13beeb654...
==========

[commit-bot: I haz the power, 2017-08-10 23:31:29]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/external/webrtc/+/3abb73819948535d13beeb654...