SetWallpaperController  115 ash/desktop_background/desktop_background_controller_unittest.cc     root_window_controller->SetWallpaperController(NULL);
SetWallpaperController  444 ash/root_window_controller.cc     SetWallpaperController(controller);
SetWallpaperController  152 ash/root_window_controller.h   void SetWallpaperController(DesktopBackgroundWidgetController* controller);