Remove remainder of Athena related code from Chrome

Remove remainder of Athena related code from Chrome.

This CL:
- Removes athena dependencies from build files for the chrome target
- Removes athena-specific files in chrome/

BUG=440818
TEST=None
R=sky,scottmg
TBR=jamescook (for change to comment in extensions/shell/browser/desktop_controller.h)

Committed: https://crrev.com/5748e135876286766151600a96283d369dba6584
Cr-Commit-Position: refs/heads/master@{#312282}

[pkotwicz, 2015-01-18 19:12:11]

pkotwicz@chromium.org changed reviewers:
+ skuhne@chromium.org

[pkotwicz, 2015-01-18 19:13:14]

Patchset #2 (id:20001) has been deleted

[pkotwicz, 2015-01-18 19:13:19]

Patchset #1 (id:1) has been deleted

[pkotwicz, 2015-01-18 19:23:49]

pkotwicz@chromium.org changed reviewers:
+ sky@chromium.org
- skuhne@chromium.org

[pkotwicz, 2015-01-18 19:23:59]

sky@ PTAL

[sky, 2015-01-20 16:28:09]

LGTM

[pkotwicz, 2015-01-20 18:33:32]

Patchset #2 (id:60001) has been deleted

[pkotwicz, 2015-01-20 18:35:15]

pkotwicz@chromium.org changed reviewers:
+ scottmg@chromium.org

[pkotwicz, 2015-01-20 18:35:15]

scottmg@ for changes in build/

[scottmg, 2015-01-20 18:47:39]

lgtm

[pkotwicz, 2015-01-20 18:52:38]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2015-01-20 18:53:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855753004/80001

[commit-bot: I haz the power, 2015-01-20 19:02:32]

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

[commit-bot: I haz the power, 2015-01-20 19:02:34]

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

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

[pkotwicz, 2015-01-20 20:45:27]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2015-01-20 20:47:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855753004/80001

[commit-bot: I haz the power, 2015-01-20 20:47:46]

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

[commit-bot: I haz the power, 2015-01-20 20:47:48]

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

[pkotwicz, 2015-01-20 21:49:45]

pkotwicz@chromium.org changed reviewers:
+ jamescook@chromium.org

[pkotwicz, 2015-01-20 21:49:52]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2015-01-20 21:51:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855753004/80001

[commit-bot: I haz the power, 2015-01-20 21:53:13]

Committed patchset #2 (id:80001)

[commit-bot: I haz the power, 2015-01-20 21:54:11]

Patchset 2 (id:??) landed as
https://crrev.com/5748e135876286766151600a96283d369dba6584
Cr-Commit-Position: refs/heads/master@{#312282}