Fix typo in 'adding_to_third_party.md' doc.

Fix typo in 'adding_to_third_party.md' doc.

R=jochen@chromium.org, zpeng@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2794723003
Cr-Commit-Position: refs/heads/master@{#465652}
Committed: https://chromium.googlesource.com/chromium/src/+/76393b28bda6890a9da2b5c866ea8d4ac435a32f

[F, 2017-04-03 14:26:34]

lgtm

[jochen (gone - plz use gerrit), 2017-04-03 15:25:03]

lgtm

[F, 2017-04-19 17:12:48]

The CQ bit was checked by zpeng@chromium.org

[commit-bot: I haz the power, 2017-04-19 17:13:13]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-19 17:24:42]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1492621968050970, "parent_rev":
"cfacebc3d54e22da4e41e763dfb3c6c7525f3e92", "commit_rev":
"76393b28bda6890a9da2b5c866ea8d4ac435a32f"}

[commit-bot: I haz the power, 2017-04-19 17:24:57]

Description was changed from

==========
Fix typo in 'adding_to_third_party.md' doc.

R=jochen@chromium.org, zpeng@chromium.org
BUG=
==========

to

==========
Fix typo in 'adding_to_third_party.md' doc.

R=jochen@chromium.org, zpeng@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2794723003
Cr-Commit-Position: refs/heads/master@{#465652}
Committed:
https://chromium.googlesource.com/chromium/src/+/76393b28bda6890a9da2b5c866ea...
==========

[commit-bot: I haz the power, 2017-04-19 17:24:58]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/76393b28bda6890a9da2b5c866ea...