Move app_launcher_utils to chrome/browser/ui/app_list

This CL moves app_launcher_util out of chrome/apps and into
chrome/browser/ui/app_list. It also renames the files from
app_launcher_util to app_list_util to be more consistent.

TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/34623014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230970 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230970