Replace OVERRIDE with their C++11 counterparts in extensions

Replace OVERRIDE with their C++11 counterparts in extensions

This is fix for newly added OVERRIDE construts in extensions folder.
This step is a giant search and replace for OVERRIDE and FINAL to
replace them with their lowercase versions.

BUG=417463
Committed: https://crrev.com/92b1a0fda90441ccd8e2d4bdf91a5657e24f10d4
Cr-Commit-Position: refs/heads/master@{#299448}

[MRV, 2014-10-14 04:56:16]

mohan.reddy@samsung.com changed reviewers:
+ benwells@chromium.org

[MRV, 2014-10-14 04:56:17]

PTAL

[benwells, 2014-10-14 06:21:01]

lgtm

[MRV, 2014-10-14 07:14:10]

The CQ bit was checked by mohan.reddy@samsung.com

[MRV, 2014-10-14 07:14:30]

On 2014/10/14 06:21:01, benwells wrote:
> lgtm

Thanks Mr. benwells.

[commit-bot: I haz the power, 2014-10-14 07:14:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/658453002/20001

[commit-bot: I haz the power, 2014-10-14 07:20:56]

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

[commit-bot: I haz the power, 2014-10-14 07:20:57]

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

[MRV, 2014-10-14 08:52:08]

The CQ bit was checked by mohan.reddy@samsung.com

[commit-bot: I haz the power, 2014-10-14 08:53:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/658453002/20001

[commit-bot: I haz the power, 2014-10-14 08:56:14]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-14 08:56:54]

Patchset 2 (id:??) landed as
https://crrev.com/92b1a0fda90441ccd8e2d4bdf91a5657e24f10d4
Cr-Commit-Position: refs/heads/master@{#299448}