Rename RootWindowHost* to WindowTreeHost*

chrome/browser/chromeos/input_method/input_method_engine.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/chromeos/input_method/input_method_engine.h"
 
 #define XK_MISCELLANY
 #include <X11/keysymdef.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
@@ skipping 218 matching lines @@
     const ui::KeyboardCode key_code = ui::KeyboardCodeFromXKeysym(xkeysym);
 
     const std::string code = event.code;
     int flags = ui::EF_NONE;
     flags |= event.alt_key   ? ui::EF_ALT_DOWN       : ui::EF_NONE;
     flags |= event.ctrl_key  ? ui::EF_CONTROL_DOWN   : ui::EF_NONE;
     flags |= event.shift_key ? ui::EF_SHIFT_DOWN     : ui::EF_NONE;
     flags |= event.caps_lock ? ui::EF_CAPS_LOCK_DOWN : ui::EF_NONE;
 
     ui::KeyEvent ui_event(type, key_code, code, flags, false /* is_char */);
-    dispatcher->AsRootWindowHostDelegate()->OnHostKeyEvent(&ui_event);
+    dispatcher->AsWindowTreeHostDelegate()->OnHostKeyEvent(&ui_event);
   }
   return true;
 }
 
 const InputMethodEngine::CandidateWindowProperty&
 InputMethodEngine::GetCandidateWindowProperty() const {
   return candidate_window_property_;
 }
 
 void InputMethodEngine::SetCandidateWindowProperty(
@@ skipping 373 matching lines @@
           // TODO(nona): Implement it.
           break;
       }
     }
   }
 
   // TODO(nona): Support item.children.
 }
 
 }  // namespace chromeos