Folds WmRootWindowController into RootWindowController

ash/common/wm/panels/panel_layout_manager.h

Index: ash/common/wm/panels/panel_layout_manager.h
diff --git a/ash/common/wm/panels/panel_layout_manager.h b/ash/common/wm/panels/panel_layout_manager.h
index 9bb17613a5f9e862b25b1d9ca03e08ed2df800ac..db78889cec275cbdfe7070ab556b843e9d5c749d 100644
--- a/ash/common/wm/panels/panel_layout_manager.h
+++ b/ash/common/wm/panels/panel_layout_manager.h
@@ -36,7 +36,7 @@ class PanelCalloutWidget;
 class WmShelf;
 
 namespace wm {
-class WmRootWindowController;
+class RootWindowController;
 }
 
 // PanelLayoutManager is responsible for organizing panels within the
@@ -170,7 +170,7 @@ class ASH_EXPORT PanelLayoutManager
   // Parent window associated with this layout manager.
   WmWindow* panel_container_;
 
-  WmRootWindowController* root_window_controller_;
+  RootWindowController* root_window_controller_;
 
   // Protect against recursive calls to OnWindowAddedToLayout().
   bool in_add_window_;