Deleted ash/shelf/alternate_app_list_button.cc.

Deleted ash/shelf/alternate_app_list_button.cc.

This file was unused since r263451 and it looks like it was accidentally
not deleted.

Committed: https://crrev.com/07816438a98fad0ff5728e7eedbb65161df9ccda
Cr-Commit-Position: refs/heads/master@{#313191}

[Matt Giuca, 2015-01-14 06:59:26]

mgiuca@chromium.org changed reviewers:
+ harrym@chromium.org

[Matt Giuca, 2015-01-14 06:59:26]

Looks like this should have been deleted in:
https://codereview.chromium.org/229453005
(which deleted its header file, its reference in ash.gyp, and all references to
it).

[Matt Giuca, 2015-01-27 00:21:29]

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

[Matt Giuca, 2015-01-27 00:21:30]

+skuhne as reviewer.

[Mr4D (OOO till 08-26), 2015-01-27 00:28:20]

Yippieh! Code is gone! LGTM!

[Matt Giuca, 2015-01-27 00:34:43]

The CQ bit was checked by mgiuca@chromium.org

[commit-bot: I haz the power, 2015-01-27 00:36:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/836753005/1

[commit-bot: I haz the power, 2015-01-27 01:28:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 01:30:13]

Patchset 1 (id:??) landed as
https://crrev.com/07816438a98fad0ff5728e7eedbb65161df9ccda
Cr-Commit-Position: refs/heads/master@{#313191}