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

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

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 a ChromeOS build using a
variation of https://codereview.chromium.org/598073004.

BUG=417463
R=avi@chromium.org

Committed: https://crrev.com/eb25a619587ab419e2a4f5d3486b8bb2d8e8a5ff
Cr-Commit-Position: refs/heads/master@{#311759}

[Avi (use Gerrit), 2015-01-15 21:37:21]

lgtm

stampity stamp

[dcheng, 2015-01-15 21:39:30]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-01-15 21:41:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/853073002/1

[commit-bot: I haz the power, 2015-01-15 23:11:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-15 23:12:45]

Patchset 1 (id:??) landed as
https://crrev.com/eb25a619587ab419e2a4f5d3486b8bb2d8e8a5ff
Cr-Commit-Position: refs/heads/master@{#311759}