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

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

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/697f429d75099ea436aee5beb9ea0c26c7dea497
Cr-Commit-Position: refs/heads/master@{#326582}

[ncarter (slow), 2015-04-23 04:02:07]

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

[ncarter (slow), 2015-04-23 04:02:08]

Hi weitaosu@ -- please review

[dcaiafa, 2015-04-23 17:29:30]

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

[dcaiafa, 2015-04-23 17:29:31]

lgtm

[ncarter (slow), 2015-04-23 17:59:31]

The CQ bit was checked by nick@chromium.org

[commit-bot: I haz the power, 2015-04-23 18:00:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1101033002/1

[commit-bot: I haz the power, 2015-04-23 18:22:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-23 18:24:41]

Patchset 1 (id:??) landed as
https://crrev.com/697f429d75099ea436aee5beb9ea0c26c7dea497
Cr-Commit-Position: refs/heads/master@{#326582}