Removes code using mus client lib

ui/views/mus/text_input_client_impl.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 UI_VIEWS_MUS_TEXT_INPUT_CLIENT_IMPL_H_
-#define UI_VIEWS_MUS_TEXT_INPUT_CLIENT_IMPL_H_
-
-#include "mojo/public/cpp/bindings/binding.h"
-#include "services/ui/public/interfaces/ime/ime.mojom.h"
-#include "ui/base/ime/composition_text.h"
-
-namespace ui {
-class TextInputClient;
-}
-
-namespace views {
-
-// TextInputClientImpl receieves updates from IME drivers over Mojo IPC, and
-// notifies the underlying ui::TextInputClient accordingly.
-class TextInputClientImpl : public ui::mojom::TextInputClient {
- public:
-  explicit TextInputClientImpl(ui::TextInputClient* text_input_client);
-  ~TextInputClientImpl() override;
-
-  ui::mojom::TextInputClientPtr CreateInterfacePtrAndBind();
-
- private:
-  // ui::mojom::TextInputClient:
-  void SetCompositionText(const ui::CompositionText& composition) override;
-  void ConfirmCompositionText() override;
-  void ClearCompositionText() override;
-  void InsertText(const std::string& text) override;
-  void InsertChar(std::unique_ptr<ui::Event> event) override;
-
-  ui::TextInputClient* text_input_client_;
-  mojo::Binding<ui::mojom::TextInputClient> binding_;
-
-  DISALLOW_COPY_AND_ASSIGN(TextInputClientImpl);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_MUS_TEXT_INPUT_CLIENT_IMPL_H_