Rename RootWindowHost* to WindowTreeHost*

ui/base/ime/input_method.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_BASE_IME_INPUT_METHOD_H_
 #define UI_BASE_IME_INPUT_METHOD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 24 matching lines @@
 //      internal::InputMethodDelegate::DispatchKeyEventPostIME API, then send
 //      a Char event using TextInputClient::InsertChar API to a text input
 //      client, which is, again, e.g. NWA or RWHVA, and then send the original
 //      key up event to the same window.
 //   2) Send VKEY_PROCESSKEY event to the window using the DispatchKeyEvent API,
 //      then update IME status (e.g. composition text) using TextInputClient,
 //      and then send the original key up event to the window.
 // - Keeps track of the focused TextInputClient to see which client can call
 //   APIs, OnTextInputTypeChanged, OnCaretBoundsChanged, and CancelComposition,
 //   that change the state of the input method.
-// In Aura environment, aura::RootWindowHost creates an instance of
+// In Aura environment, aura::WindowTreeHost creates an instance of
 // ui::InputMethod and owns it.
 class InputMethod {
  public:
   // TODO(yukawa): Move these typedef into ime_constants.h or somewhere.
 #if defined(OS_WIN)
   typedef LRESULT NativeEventResult;
 #else
   typedef int32 NativeEventResult;
 #endif
 
@@ skipping 99 matching lines @@
   virtual bool IsCandidatePopupOpen() const = 0;
 
   // Management of the observer list.
   virtual void AddObserver(InputMethodObserver* observer) = 0;
   virtual void RemoveObserver(InputMethodObserver* observer) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_H_