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

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

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 automatically generated with an OS=android build using a
variation of https://codereview.chromium.org/598073004.

BUG=417463
R=bauerb@chromium.org

Committed: https://crrev.com/7241f5fdbb0c7de0beddf61fb16cbc0a224eaa8b
Cr-Commit-Position: refs/heads/master@{#314618}

[Bernhard Bauer, 2015-02-04 10:55:29]

lgtm

[dcheng, 2015-02-04 18:37:50]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-02-04 18:38:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884213005/1

[commit-bot: I haz the power, 2015-02-04 18:42:30]

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

[commit-bot: I haz the power, 2015-02-04 18:42:31]

Try jobs failed on following builders:
  ios_dbg_simulator on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ng on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ng...)
  ios_rel_device_ninja_ng on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[dcheng, 2015-02-04 19:23:24]

New patchsets have been uploaded after l-g-t-m from bauerb@chromium.org

[dcheng, 2015-02-04 19:23:42]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-02-04 19:23:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/884213005/20001

[commit-bot: I haz the power, 2015-02-04 20:12:21]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-04 20:13:19]

Patchset 2 (id:??) landed as
https://crrev.com/7241f5fdbb0c7de0beddf61fb16cbc0a224eaa8b
Cr-Commit-Position: refs/heads/master@{#314618}