Folds WmRootWindowController into RootWindowController

ash/aura/wm_lookup_aura.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_AURA_WM_LOOKUP_AURA_H_
 #define ASH_AURA_WM_LOOKUP_AURA_H_
 
 #include "ash/common/wm_lookup.h"
 #include "base/macros.h"
 
 namespace ash {
 
 // Aura implementation of WmLookup.
 class WmLookupAura : public WmLookup {
  public:
   WmLookupAura();
   ~WmLookupAura() override;
 
   // WmLookup:
-  WmRootWindowController* GetRootWindowControllerWithDisplayId(
+  RootWindowController* GetRootWindowControllerWithDisplayId(
       int64_t id) override;
   WmWindow* GetWindowForWidget(views::Widget* widget) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WmLookupAura);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AURA_WM_LOOKUP_AURA_H_