Prevent refocus of the app list on hide.
This CL fixes an issue where the app list would be refocused as it was hiding,
leading to bad focus behavior when clicking off the app list.
This was being caused by the app list search box getting cleared when the app
list was hidden, triggering a refocus. Not refocusing when the app list is
hidden fixes the issue.
BUG=387559
Review URL: https://codereview.chromium.org/
351773004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@279585 0039d316-1c4b-4281-b951-d872f2087c98