Unify IMEDriver and IMEServer.

chrome/browser/ui/views/ime_driver/ime_driver_mus.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_IME_DRIVER_MUS_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_DRIVER_IME_DRIVER_MUS_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 
-#include "mojo/public/cpp/bindings/binding.h"
 #include "services/ui/public/interfaces/ime/ime.mojom.h"
 
 class IMEDriver : public ui::mojom::IMEDriver {
  public:
   IMEDriver();
   ~IMEDriver() override;
 
   // Instantiate the IME driver and register it to the UI service.
   static void Register();
 
  private:
   // ui::mojom::IMEDriver:
-  void StartSession(int32_t session_id,
-                    ui::mojom::StartSessionDetailsPtr details) override;
-  void CancelSession(int32_t session_id) override;
-
-  std::map<int32_t, std::unique_ptr<mojo::Binding<ui::mojom::InputMethod>>>
-      input_method_bindings_;
+  void StartSession(ui::mojom::StartSessionDetailsPtr details) override;
 
   DISALLOW_COPY_AND_ASSIGN(IMEDriver);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_DRIVER_IME_DRIVER_MUS_H_