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Also ShellDesktopController has its own logic to initialize the
window manager, and its subclass (like Athena) can initialize
its own window management logic.

R=jamescook@chromium.org, oshima@chromium.org
TEST=no logic changes, confirmed athena_main running
BUG=

Review URL: https://codereview.chromium.org/308783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274263 0039d316-1c4b-4281-b951-d872f2087c98