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

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

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=jamescook@chromium.org

Committed: https://crrev.com/222b9c73256c2c8b2e119ca55cb8a8426b93d5db
Cr-Commit-Position: refs/heads/master@{#311791}

[James Cook, 2015-01-15 20:43:18]

LGTM with one question

https://codereview.chromium.org/800983006/diff/1/ash/system/chromeos/screen_s...
File ash/system/chromeos/screen_security/screen_tray_item.h (right):

https://codereview.chromium.org/800983006/diff/1/ash/system/chromeos/screen_s...
ash/system/chromeos/screen_security/screen_tray_item.h:121: views::View*
CreateTrayView(user::LoginStatus status) override = 0;
I think this is correct, but it looks a little odd. Does this look OK to you?

[dcheng, 2015-01-15 21:01:45]

https://codereview.chromium.org/800983006/diff/1/ash/system/chromeos/screen_s...
File ash/system/chromeos/screen_security/screen_tray_item.h (right):

https://codereview.chromium.org/800983006/diff/1/ash/system/chromeos/screen_s...
ash/system/chromeos/screen_security/screen_tray_item.h:121: views::View*
CreateTrayView(user::LoginStatus status) override = 0;
On 2015/01/15 20:43:18, James Cook wrote:
> I think this is correct, but it looks a little odd. Does this look OK to you?

Usually people don't specify these if they're just going to mark them pure, but
if they are inherited from a superclass and pure, this seems like the correct
way to write it.

[dcheng, 2015-01-15 21:01:51]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-01-15 21:02:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/800983006/1

[commit-bot: I haz the power, 2015-01-15 21:15:35]

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

[commit-bot: I haz the power, 2015-01-15 21:15:36]

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

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

[dcheng, 2015-01-15 21:41:02]

The CQ bit was checked by dcheng@chromium.org

[commit-bot: I haz the power, 2015-01-15 21:42:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/800983006/20001

[commit-bot: I haz the power, 2015-01-16 00:48:32]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-01-16 00:49:55]

Patchset 2 (id:??) landed as
https://crrev.com/222b9c73256c2c8b2e119ca55cb8a8426b93d5db
Cr-Commit-Position: refs/heads/master@{#311791}