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

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

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.

NOTRY=true
BUG=417463
Committed: https://crrev.com/bd48e5909786f81f75052d45e770c823b5935d3e
Cr-Commit-Position: refs/heads/master@{#326845}

[ncarter (slow), 2015-04-23 02:54:12]

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

[no sievers, 2015-04-23 20:27:55]

lgtm

[ncarter (slow), 2015-04-23 20:37:10]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-23 20:37:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101013002/1

[commit-bot: I haz the power, 2015-04-23 21:31:48]

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

[commit-bot: I haz the power, 2015-04-23 21:31:49]

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

[ncarter (slow), 2015-04-23 22:21:50]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-23 22:22:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101013002/1

[commit-bot: I haz the power, 2015-04-23 23:21:59]

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

[commit-bot: I haz the power, 2015-04-23 23:22:00]

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

[ncarter (slow), 2015-04-24 03:06:02]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-24 03:06:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101013002/1

[commit-bot: I haz the power, 2015-04-24 03:55:23]

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

[commit-bot: I haz the power, 2015-04-24 03:55:23]

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

[ncarter (slow), 2015-04-24 16:10:59]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-24 16:11:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101013002/1

[commit-bot: I haz the power, 2015-04-24 17:02:10]

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

[commit-bot: I haz the power, 2015-04-24 17:02:11]

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

[Nico, 2015-04-24 17:59:28]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-04-24 18:00:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101013002/1

[ncarter (slow), 2015-04-24 18:21:49]

This is failing to land because of a preexisting missing build dependency (bug
481110); I'm adding NOTRY=true to land it.

[commit-bot: I haz the power, 2015-04-24 18:33:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-24 18:34:42]

Patchset 1 (id:??) landed as
https://crrev.com/bd48e5909786f81f75052d45e770c823b5935d3e
Cr-Commit-Position: refs/heads/master@{#326845}