Revert of Moves definitions of RootWindowController into root_window_controller.cc

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 910421fd33149fb9e52d3d4a4e610275b3a8746f..64e589a118b3a4e5ba4c82b9da205ef66e40aa1a 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -306,6 +306,10 @@
   // Creates the containers (WmWindows) used by the shell.
   void CreateContainers();
 
+  // Creates the LayoutManagers for the windows created by CreateContainers().
+  // TODO(sky): merge this with InitLayoutManagers().
+  void CreateLayoutManagers();
+
   // Initializes |system_wallpaper_| and possibly also |boot_splash_screen_|.
   // The initial color is determined by the |root_window_type| and whether or
   // not this is the first boot.
@@ -328,6 +332,9 @@
   // Overridden from ShellObserver.
   void OnLoginStateChanged(LoginStatus status) override;
   void OnTouchHudProjectionToggled(bool enabled) override;
+
+  // TODO(sky): temporary, fold into CloseChildWindows().
+  void CloseChildWindowsImpl();
 
   std::unique_ptr<AshWindowTreeHost> ash_host_;
   std::unique_ptr<aura::WindowTreeHost> mus_window_tree_host_;