Remove generics for header and footer of CollectionViewModel

Remove generics for header and footer of CollectionViewModel

The headers and footer of the CollectionViewModel should not be parameterized
as the implementation as Item is a convenience.

BUG=none

Review-Url: https://codereview.chromium.org/2750373004
Cr-Commit-Position: refs/heads/master@{#457723}
Committed: https://chromium.googlesource.com/chromium/src/+/2b92612c689659ab1b3061fcacdc4e99715788dd

[gambard, 2017-03-17 08:52:41]

gambard@chromium.org changed reviewers:
+ lpromero@chromium.org

[gambard, 2017-03-17 08:52:41]

PTAL!

[lpromero, 2017-03-17 09:02:30]

The CQ bit was checked by lpromero@chromium.org

[lpromero, 2017-03-17 09:02:30]

lgtm

[commit-bot: I haz the power, 2017-03-17 09:02:40]

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, 2017-03-17 09:14:51]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489741350259680, "parent_rev":
"49e5417df55af98a03d4a055755fdf05ec093d7c", "commit_rev":
"2b92612c689659ab1b3061fcacdc4e99715788dd"}

[commit-bot: I haz the power, 2017-03-17 09:15:36]

Description was changed from

==========
Remove generics for header and footer of CollectionViewModel

The headers and footer of the CollectionViewModel should not be parameterized
as the implementation as Item is a convenience.

BUG=none
==========

to

==========
Remove generics for header and footer of CollectionViewModel

The headers and footer of the CollectionViewModel should not be parameterized
as the implementation as Item is a convenience.

BUG=none

Review-Url: https://codereview.chromium.org/2750373004
Cr-Commit-Position: refs/heads/master@{#457723}
Committed:
https://chromium.googlesource.com/chromium/src/+/2b92612c689659ab1b3061fcacdc...
==========

[commit-bot: I haz the power, 2017-03-17 09:15:39]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2b92612c689659ab1b3061fcacdc...