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Make ShelfLayoutController a ShelfLayoutManager for launcher, status windows.

Relanding http://codereview.chromium.org/8743014/
win_aura buildbot just needed a clobber.

BUG=105661
TEST=Manual. Status area is represented with all icons on Aura.
TBR=sky

Review URL: http://codereview.chromium.org/8819016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113201 0039d316-1c4b-4281-b951-d872f2087c98