Rename RootWindowHost to WindowTreeHost

ui/views/win/hwnd_message_handler.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_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <windows.h>
 #include <atlbase.h>
 #include <atlapp.h>
@@ skipping 85 matching lines @@
     wParam; \
     lParam; \
     lResult; \
     bHandled; \
     switch(dwMsgMapID) { \
       case 0:
 
 // An object that handles messages for a HWND that implements the views
 // "Custom Frame" look. The purpose of this class is to isolate the windows-
 // specific message handling from the code that wraps it. It is intended to be
-// used by both a views::NativeWidget and an aura::RootWindowHost
+// used by both a views::NativeWidget and an aura::WindowTreeHost
 // implementation.
 // TODO(beng): This object should eventually *become* the WindowImpl.
 class VIEWS_EXPORT HWNDMessageHandler :
     public gfx::WindowImpl,
     public internal::InputMethodDelegate,
     public base::MessageLoopForUI::Observer {
  public:
   explicit HWNDMessageHandler(HWNDMessageHandlerDelegate* delegate);
   ~HWNDMessageHandler();
 
@@ skipping 421 matching lines @@
 };
 
 // This window property if set on the window does not activate the window for a
 // touch based WM_MOUSEACTIVATE message.
 const wchar_t kIgnoreTouchMouseActivateForWindow[] =
     L"Chrome.IgnoreMouseActivate";
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_