Rename RootWindowHost to WindowTreeHost

ui/views/corewm/tooltip_win.h

 // Copyright 2013 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_COREWM_TOOLTIP_WIN_H_
 #define UI_VIEWS_COREWM_TOOLTIP_WIN_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/strings/string16.h"
 #include "ui/gfx/point.h"
 #include "ui/views/corewm/tooltip.h"
 
 #include <windows.h>
 #include <commctrl.h>
 
 namespace views {
 namespace corewm {
 
 // Implementation of Tooltip that uses the native win32 control for showing the
 // tooltip.
 class VIEWS_EXPORT TooltipWin : public Tooltip {
  public:
   explicit TooltipWin(HWND parent);
   virtual ~TooltipWin();
 
-  // HandleNotify() is forwarded from DesktopRootWindowHostWin to keep the
+  // HandleNotify() is forwarded from DesktopWindowTreeHostWin to keep the
   // native tooltip in sync.
   bool HandleNotify(int w_param, NMHDR* l_param, LRESULT* l_result);
 
  private:
   // Ensures |tooltip_hwnd_| is valid. Returns true if valid, false if there
   // a problem creating |tooltip_hwnd_|.
   bool EnsureTooltipWindow();
 
   // Sets the position of the tooltip.
   void PositionTooltip();
@@ skipping 23 matching lines @@
   // cache it.
   gfx::Point location_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipWin);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_TOOLTIP_WIN_H_