Remove InputMethodEventHandler.

extensions/shell/browser/input_method_event_handler.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 EXTENSIONS_SHELL_BROWSER_INPUT_METHOD_EVENT_HANDLER_H_
-#define EXTENSIONS_SHELL_BROWSER_INPUT_METHOD_EVENT_HANDLER_H_
-
-#include "base/macros.h"
-#include "ui/events/event_handler.h"
-
-namespace ui {
-class InputMethod;
-class KeyEvent;
-}
-
-namespace extensions {
-
-// Basic EventHandler for dispatching key events.
-class InputMethodEventHandler : public ui::EventHandler {
- public:
-  explicit InputMethodEventHandler(ui::InputMethod* input_method);
-  ~InputMethodEventHandler() override;
-
-  void set_post_ime(bool post_ime);
-
- private:
-  // ui::EventHandler:
-  void OnKeyEvent(ui::KeyEvent* event) override;
-
-  // The input method to pass events. Should outlive this handler.
-  ui::InputMethod* input_method_;
-
-  // True when an event is dispatched within DispatchKeyEventPostIME(), meaning
-  // it has already been processed by the input method.
-  bool post_ime_;
-
-  DISALLOW_COPY_AND_ASSIGN(InputMethodEventHandler);
-};
-
-}  // namespace extensions
-
-#endif  // EXTENSIONS_SHELL_BROWSER_INPUT_METHOD_EVENT_HANDLER_H_