ash: Move launcher_view* to shelf/ directory.

BUG=248353
TEST=none, no functional changes.
R=jamescook@chromium.org, xiyuan@chromium.org
TBR=sky@chromium.org # for chrome/browser/ui

Review URL: https://codereview.chromium.org/27628002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229274 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229274