Removes code using mus client lib

ui/views/mus/text_input_client_impl.cc

-// 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.
-
-#include "ui/views/mus/text_input_client_impl.h"
-
-#include "base/strings/utf_string_conversions.h"
-#include "ui/base/ime/text_input_client.h"
-#include "ui/views/mus/input_method_mus.h"
-
-namespace views {
-
-TextInputClientImpl::TextInputClientImpl(ui::TextInputClient* text_input_client)
-    : text_input_client_(text_input_client), binding_(this) {}
-
-TextInputClientImpl::~TextInputClientImpl() {}
-
-ui::mojom::TextInputClientPtr TextInputClientImpl::CreateInterfacePtrAndBind() {
-  return binding_.CreateInterfacePtrAndBind();
-}
-
-void TextInputClientImpl::SetCompositionText(
-    const ui::CompositionText& composition) {
-  text_input_client_->SetCompositionText(composition);
-}
-
-void TextInputClientImpl::ConfirmCompositionText() {
-  text_input_client_->ConfirmCompositionText();
-}
-
-void TextInputClientImpl::ClearCompositionText() {
-  text_input_client_->ClearCompositionText();
-}
-
-void TextInputClientImpl::InsertText(const std::string& text) {
-  text_input_client_->InsertText(base::UTF8ToUTF16(text));
-}
-
-void TextInputClientImpl::InsertChar(std::unique_ptr<ui::Event> event) {
-  DCHECK(event->IsKeyEvent());
-  text_input_client_->InsertChar(*event->AsKeyEvent());
-}
-
-}  // namespace views