Fix "unused variable" warnings.

Fix "unused variable" warnings.

These were exposed by changing DISALLOW_COPY_AND_ASSIGN to use "= delete", and
must be fixed before that change can land.

See https://codereview.chromium.org/1981053002/ for the full CL.

BUG=447156
TEST=none

Committed: https://crrev.com/9d32759613f098ea04b62ad4f7bd7ef3413a3265
Cr-Commit-Position: refs/heads/master@{#394834}

[Peter Kasting, 2016-05-19 07:19:40]

pkasting@chromium.org changed reviewers:
+ asargent@chromium.org

[asargent_no_longer_on_chrome, 2016-05-19 19:03:02]

lgtm

[Peter Kasting, 2016-05-19 19:29:37]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2016-05-19 19:30:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1990173002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1990173002/1

[commit-bot: I haz the power, 2016-05-19 19:37:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-19 19:38:29]

Description was changed from

==========
Fix "unused variable" warnings.

These were exposed by changing DISALLOW_COPY_AND_ASSIGN to use "= delete", and
must be fixed before that change can land.

See https://codereview.chromium.org/1981053002/ for the full CL.

BUG=447156
TEST=none
==========

to

==========
Fix "unused variable" warnings.

These were exposed by changing DISALLOW_COPY_AND_ASSIGN to use "= delete", and
must be fixed before that change can land.

See https://codereview.chromium.org/1981053002/ for the full CL.

BUG=447156
TEST=none

Committed: https://crrev.com/9d32759613f098ea04b62ad4f7bd7ef3413a3265
Cr-Commit-Position: refs/heads/master@{#394834}
==========

[commit-bot: I haz the power, 2016-05-19 19:38:30]

Patchset 1 (id:??) landed as
https://crrev.com/9d32759613f098ea04b62ad4f7bd7ef3413a3265
Cr-Commit-Position: refs/heads/master@{#394834}