Stop app list folder animation from hiding item text label.

Stop app list folder animation from hiding item text label.

This CL fixes an issue where the app list folder animation would hide the
item label for its animation, causing the text to pop in at the end of
animation.

This is fixed by only hiding the icon rather than the entire AppListItemView
during the animation.

BUG=393207
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283331

[Matt Giuca, 2014-07-15 01:49:24]

lgtm

[calamity, 2014-07-15 01:49:30]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2014-07-15 01:50:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/calamity@chromium.org/395653005/1

[commit-bot: I haz the power, 2014-07-15 13:56:28]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_x64_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_x64_rel/...)

[commit-bot: I haz the power, 2014-07-15 18:09:41]

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

[commit-bot: I haz the power, 2014-07-15 18:09:43]

Try jobs failed on following builders:
  win8_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win8_chromium_rel/bui...)

[calamity, 2014-07-16 02:19:21]

The CQ bit was checked by calamity@chromium.org

[commit-bot: I haz the power, 2014-07-16 02:21:16]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/calamity@chromium.org/395653005/1

[commit-bot: I haz the power, 2014-07-16 04:26:48]

Change committed as 283331