chromeos: Remove unused private data members

chromeos: Remove unused private data members

To avoid having a lot of -Wunused-private-field warnings when using "=delete" to implement DISALLOW_COPY_AND_ASSIGN.

BUG=447445
Committed: https://crrev.com/7da6008071b06ba9c734a0cba6979ea411b060d2
Cr-Commit-Position: refs/heads/master@{#310728}

[hashimoto, 2015-01-09 06:53:38]

hashimoto@chromium.org changed reviewers:
+ satorux@chromium.org

[satorux1, 2015-01-09 07:37:53]

lgtm. good catch.

[hashimoto, 2015-01-09 07:40:12]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2015-01-09 07:41:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/790793008/1

[commit-bot: I haz the power, 2015-01-09 07:45:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-09 07:46:05]

Patchset 1 (id:??) landed as
https://crrev.com/7da6008071b06ba9c734a0cba6979ea411b060d2
Cr-Commit-Position: refs/heads/master@{#310728}