Fix search box shadowing issue on classic app list.

Fix search box shadowing issue on classic app list.

This CL fixes a bug with the classic app list where the search box
would turn grey when typing into it. This was happening because the
shadow value from the experimental app list was being used.

BUG=469983
Committed: https://crrev.com/f046e9d204b7a2fde8e31259ddfb0248771431da
Cr-Commit-Position: refs/heads/master@{#321961}

[calamity, 2015-03-24 07:12:55]

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

[Matt Giuca, 2015-03-24 07:37:39]

The CQ bit was checked by mgiuca@chromium.org

[Matt Giuca, 2015-03-24 07:37:40]

lgtm

[commit-bot: I haz the power, 2015-03-24 07:37:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1027513004/1

[commit-bot: I haz the power, 2015-03-24 10:02:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 10:03:29]

Patchset 1 (id:??) landed as
https://crrev.com/f046e9d204b7a2fde8e31259ddfb0248771431da
Cr-Commit-Position: refs/heads/master@{#321961}