IME for Mus: Remove OnTextInputModeChanged() from IME's mojo API.

chrome/browser/ui/views/ime_driver/simple_input_method.h

 // Copyright 2016 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 CHROME_BROWSER_UI_VIEWS_IME_DRIVER_SIMPLE_INPUT_METHOD_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_DRIVER_SIMPLE_INPUT_METHOD_H_
 
 #include "services/ui/public/interfaces/ime/ime.mojom.h"
 
 // This is to be used on platforms where a proper implementation of
 // ui::mojom::InputMethod is missing. It doesn't handle any events and calls
 // the callback with false, which will result in client code handling events
 // locally.
 class SimpleInputMethod : public ui::mojom::InputMethod {
  public:
   SimpleInputMethod();
   ~SimpleInputMethod() override;
 
   // ui::mojom::InputMethod:
-  void OnTextInputModeChanged(ui::TextInputMode text_input_mode) override;
   void OnTextInputTypeChanged(ui::TextInputType text_input_type) override;
   void OnCaretBoundsChanged(const gfx::Rect& caret_bounds) override;
   void ProcessKeyEvent(std::unique_ptr<ui::Event> key_event,
                        const ProcessKeyEventCallback& callback) override;
   void CancelComposition() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SimpleInputMethod);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_DRIVER_SIMPLE_INPUT_METHOD_H_