Folds WmRootWindowController into RootWindowController

ash/common/wm_window.h

Index: ash/common/wm_window.h
diff --git a/ash/common/wm_window.h b/ash/common/wm_window.h
index 927863bbb22388ccfaf18882fa6b921ac6060fce..d94862555fd1ce330c93a6edf38c1401939a0642 100644
--- a/ash/common/wm_window.h
+++ b/ash/common/wm_window.h
@@ -42,8 +42,8 @@ class Widget;
 namespace ash {
 
 class ImmersiveFullscreenController;
+class RootWindowController;
 class WmLayoutManager;
-class WmRootWindowController;
 class WmShell;
 class WmTransientWindowObserver;
 class WmWindowObserver;
@@ -72,7 +72,7 @@ class ASH_EXPORT WmWindow {
         const_cast<const WmWindow*>(this)->GetRootWindow());
   }
   virtual const WmWindow* GetRootWindow() const = 0;
-  virtual WmRootWindowController* GetRootWindowController() = 0;
+  virtual RootWindowController* GetRootWindowController() = 0;
 
   // TODO(sky): fix constness.
   virtual WmShell* GetShell() const = 0;