Remove deprecation warning banner from App Launcher code.

Should have no visible effect (since the banner wasn't visible on CrOS).

This reverts commit 192a6f001ffe62cca3b685fcd7ca5e43b7896695.
This reverts commit c00f1d07c1aca9fcfddbc40ed1057425cac020fc.

BUG=576531

Review-Url: https://codereview.chromium.org/2341113003
Cr-Commit-Position: refs/heads/master@{#419111}
11 files changed