Update {virtual,override} to follow C++11 style in device.

Update {virtual,override} to follow C++11 style in device.

The Google style guide states that only one of {virtual,override,final} should be used for each declaration, since override implies virtual and final implies both virtual and override.

This patch was manually generated using a regex and a text editor.

BUG=417463
Committed: https://crrev.com/77137323157640d3eecae553956425c067054383
Cr-Commit-Position: refs/heads/master@{#326609}

[ncarter (slow), 2015-04-23 04:36:06]

nick@chromium.org changed reviewers:
+ rpaquay@chromium.org

[ncarter (slow), 2015-04-23 04:36:06]

rpaquay: please review

[timvolodine, 2015-04-23 10:47:07]

timvolodine@chromium.org changed reviewers:
+ timvolodine@chromium.org

[timvolodine, 2015-04-23 10:47:07]

lgtm device/battery

[rpaquay, 2015-04-23 16:12:47]

lgtm

[ncarter (slow), 2015-04-23 16:49:52]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-23 16:50:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1107433002/1

[commit-bot: I haz the power, 2015-04-23 16:57:36]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-23 16:57:37]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[ncarter (slow), 2015-04-23 18:27:12]

The CQ bit was checked by nick@chromium.org

[ncarter (slow), 2015-04-23 18:27:12]

The patchset sent to the CQ was uploaded after l-g-t-m from
rpaquay@chromium.org, timvolodine@chromium.org
Link to the patchset: https://codereview.chromium.org/1107433002/#ps20001
(title: "sync and git cl format")

[commit-bot: I haz the power, 2015-04-23 18:28:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1107433002/20001

[commit-bot: I haz the power, 2015-04-23 19:40:38]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-23 19:42:15]

Patchset 2 (id:??) landed as
https://crrev.com/77137323157640d3eecae553956425c067054383
Cr-Commit-Position: refs/heads/master@{#326609}