MD downloads: incorporate UX sync feedback

MD downloads: incorporate UX sync feedback

Finished download items with an externally removed file are
too short. Make them at least as tall as the icon is wide.

R=groby@chromium.org
BUG=425626
Committed: https://crrev.com/9302bf904b82902069217e1d95dff12192fd40b0
Cr-Commit-Position: refs/heads/master@{#342053}

[groby-ooo-7-16, 2015-08-06 00:51:05]

lgtm

[Dan Beam, 2015-08-06 01:03:03]

The CQ bit was checked by dbeam@chromium.org

[commit-bot: I haz the power, 2015-08-06 01:03:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1272933002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1272933002/1

[commit-bot: I haz the power, 2015-08-06 02:37:12]

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

[commit-bot: I haz the power, 2015-08-06 02:37:13]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Dan Beam, 2015-08-06 02:49:24]

The CQ bit was checked by dbeam@chromium.org

[commit-bot: I haz the power, 2015-08-06 02:49:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1272933002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1272933002/1

[commit-bot: I haz the power, 2015-08-06 03:31:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-06 03:32:32]

Patchset 1 (id:??) landed as
https://crrev.com/9302bf904b82902069217e1d95dff12192fd40b0
Cr-Commit-Position: refs/heads/master@{#342053}