Simplify manifest-related code in Port to only support new format.

Simplify manifest-related code in Port to only support new format.

BUG=678077
Review-Url: https://codereview.chromium.org/2624333004
Cr-Commit-Position: refs/heads/master@{#443441}
Committed: https://chromium.googlesource.com/chromium/src/+/b8c6519a9b138d12402e34fd305b9fab6f7b403e

[qyearsley, 2017-01-12 19:37:42]

qyearsley@chromium.org changed reviewers:
+ jeffcarp@chromium.org

[jeffcarp, 2017-01-12 21:10:07]

lgtm

[qyearsley, 2017-01-12 21:49:55]

The CQ bit was checked by qyearsley@chromium.org

[commit-bot: I haz the power, 2017-01-12 21:50:22]

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, 2017-01-13 01:38:24]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484257795919480, "parent_rev":
"d29667992640dc24a65202828f64e7517aa5aba0", "commit_rev":
"b8c6519a9b138d12402e34fd305b9fab6f7b403e"}

[commit-bot: I haz the power, 2017-01-13 01:38:58]

Description was changed from

==========
Simplify manifest-related code in Port to only support new format.

BUG=678077
==========

to

==========
Simplify manifest-related code in Port to only support new format.

BUG=678077

Review-Url: https://codereview.chromium.org/2624333004
Cr-Commit-Position: refs/heads/master@{#443441}
Committed:
https://chromium.googlesource.com/chromium/src/+/b8c6519a9b138d12402e34fd305b...
==========

[commit-bot: I haz the power, 2017-01-13 01:38:59]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b8c6519a9b138d12402e34fd305b...