cleanup: Use IsTextInputTypeNone() in OnInputMethodChanged().

ui/base/ime/input_method.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include <string>
 
@@ skipping 32 matching lines @@
 // - 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
 // ui::InputMethod and owns it.
 class UI_EXPORT InputMethod {
  public:
   virtual ~InputMethod() {}
 
   // Sets the delegate used by this InputMethod instance. It should only be
-  // called by an object which manages the whole UI (e.g. aura::RootWindowHost).
+  // called by an object which manages the whole UI.
   virtual void SetDelegate(internal::InputMethodDelegate* delegate) = 0;
 
   // Initializes the InputMethod object. Pass true if the system toplevel window
   // already has keyboard focus.
   virtual void Init(bool focused) = 0;
 
   // Called when the top-level system window gets keyboard focus.
   virtual void OnFocus() = 0;
 
   // Called when the top-level system window loses keyboard focus.
@@ skipping 51 matching lines @@
   virtual bool IsActive() = 0;
 
   // Gets the text input type of the focused text input client. Returns
   // ui::TEXT_INPUT_TYPE_NONE if there is no focused client.
   virtual TextInputType GetTextInputType() const = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_H_