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

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

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/9a2f9766856f4cc6ac5e56f65be8a6ca6523460b
Cr-Commit-Position: refs/heads/master@{#326517}

[ncarter (slow), 2015-04-23 04:03:13]

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

[ncarter (slow), 2015-04-23 04:03:14]

rogerta: please review

[Roger Tawa OOO till Jul 10th, 2015-04-23 14:33:36]

lgtm

[ncarter (slow), 2015-04-23 14:45:26]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-23 14:45:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1097393008/1

[commit-bot: I haz the power, 2015-04-23 14:49:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-23 14:51:17]

Patchset 1 (id:??) landed as
https://crrev.com/9a2f9766856f4cc6ac5e56f65be8a6ca6523460b
Cr-Commit-Position: refs/heads/master@{#326517}