Replace the HomeCard by the AppList in Athena (2nd)

Replace the HomeCard by the AppList in Athena (2nd)

This is a reland of https://codereview.chromium.org/306083005/.
That was reverted because it implicitly added a dependency on
content from athena_shell.

This is identical to the original CL but still safe because
the dependency issue has been fixed already.

BUG=370204
TBR=oshima@chromium.org, benwells@chromium.org, reed@google.com
TEST=manually

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275373

[Jun Mukai, 2014-06-05 19:49:32]

The CQ bit was checked by mukai@chromium.org

[commit-bot: I haz the power, 2014-06-05 19:51:54]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mukai@chromium.org/317163004/1

[commit-bot: I haz the power, 2014-06-06 02:53:41]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-06-06 06:39:42]

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

[commit-bot: I haz the power, 2014-06-06 06:39:43]

Try jobs failed on following builders:
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)

[Jun Mukai, 2014-06-06 08:29:11]

The CQ bit was checked by mukai@chromium.org

[commit-bot: I haz the power, 2014-06-06 08:31:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mukai@chromium.org/317163004/1

[commit-bot: I haz the power, 2014-06-06 10:22:52]

Change committed as 275373