Rename RootWindowHost* to WindowTreeHost*

ash/display/virtual_keyboard_window_controller.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 "ash/display/virtual_keyboard_window_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/root_window_transformers.h"
@@ skipping 25 matching lines @@
   root_window_controller_->ActivateKeyboard(keyboard_controller);
 }
 
 void VirtualKeyboardWindowController::UpdateWindow(
     const DisplayInfo& display_info) {
   static int virtual_keyboard_root_window_count = 0;
   if (!root_window_controller_.get()) {
     const gfx::Rect& bounds_in_native = display_info.bounds_in_native();
     aura::RootWindow::CreateParams params(bounds_in_native);
     params.host = Shell::GetInstance()->root_window_host_factory()->
-        CreateRootWindowHost(bounds_in_native);
+        CreateWindowTreeHost(bounds_in_native);
     aura::RootWindow* root_window = new aura::RootWindow(params);
 
     root_window->window()->SetName(
         base::StringPrintf("VirtualKeyboardRootWindow-%d",
                            virtual_keyboard_root_window_count++));
 
     // No need to remove RootWindowObserver because
     // the DisplayController object outlives RootWindow objects.
     root_window->AddRootWindowObserver(
         Shell::GetInstance()->display_controller());
@@ skipping 36 matching lines @@
 
   aura::RootWindow* root_window = root_window_controller_->dispatcher();
   scoped_ptr<aura::RootWindowTransformer> transformer(
       internal::CreateRootWindowTransformerForDisplay(root_window->window(),
           display_manager->non_desktop_display()));
   root_window->host()->SetRootWindowTransformer(transformer.Pass());
 }
 
 }  // namespace internal
 }  // namespace ash