Make aura::clients take Window instead of RootWindow

ui/aura/client/capture_delegate.h

 // Copyright (c) 2012 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 UI_AURA_CLIENT_CAPTURE_DELEGATE_H_
 #define UI_AURA_CLIENT_CAPTURE_DELEGATE_H_
 
 #include "ui/aura/aura_export.h"
 
 namespace aura {
 class Window;
 namespace client {
 
-// This interface provides API to change the RootWindow's capture state
-// without exposing them as RootWindow API.
+// This interface provides API to change the root Window's capture state without
+// exposing them as RootWindow API.
 class AURA_EXPORT CaptureDelegate {
  public:
   // Called when a capture is set on the |new_capture| which is owned by
   // this root window, and/or a capture is released on the |old_capture|
   // which is owned by this root window.
   virtual void UpdateCapture(aura::Window* old_capture,
                              aura::Window* new_capture) = 0;
   // Sets/Release a native capture on host windows.
   virtual void SetNativeCapture() = 0;
   virtual void ReleaseNativeCapture() = 0;
 
  protected:
   virtual ~CaptureDelegate() {}
 };
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_CAPTURE_DELEGATE_H_