exec chromeos-wm so it will be an immediate child of session_manager
exec chromeos-wm so it will be an immediate child of session_manager

Change-Id: I5895e533ee3755240a50b090d0ed592c0a9985ae

BUG=none
TEST=ps -fp $(ps -o ppid= -C chromeos-wm)

Review URL: http://codereview.chromium.org/3424014

joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager,joshfire/chromiumos-platform-window_manager