Rename RootWindowHost* to WindowTreeHost*

chrome/browser/ui/views/frame/browser_frame_ashwin.cc

 // 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.
 
 #include "chrome/browser/ui/views/frame/browser_frame_ashwin.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/metro_utils/metro_chrome_win.h"
@@ skipping 12 matching lines @@
   BrowserFrameAsh::OnWindowFocused(gained_focus, lost_focus);
   if (GetNativeWindow() != gained_focus)
     return;
 
   // TODO(shrikant): We need better way to handle chrome activation.
   // There may be cases where focus events do not follow a user
   // action to create or focus a window
 
   // If the activated window is in Metro mode, and the viewer process window is
   // not in the foreground, activate Metro Chrome.
-  if (!aura::RemoteRootWindowHostWin::Instance()->IsForegroundWindow() &&
+  if (!aura::RemoteWindowTreeHostWin::Instance()->IsForegroundWindow() &&
       !browser_shutdown::IsTryingToQuit()) {
     // PostTask because ActivateMetroChrome can not be called nested in another
     // ::SendMessage().
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(base::IgnoreResult(chrome::ActivateMetroChrome)));
   }
 }