Remove InputMethodEventHandler.

extensions/shell/browser/input_method_event_handler.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 "extensions/shell/browser/input_method_event_handler.h"
-
-#include "ui/base/ime/input_method.h"
-#include "ui/events/event.h"
-
-namespace extensions {
-
-InputMethodEventHandler::InputMethodEventHandler(ui::InputMethod* input_method)
-    : input_method_(input_method), post_ime_(false) {
-  DCHECK(input_method_);
-}
-
-InputMethodEventHandler::~InputMethodEventHandler() {}
-
-void InputMethodEventHandler::set_post_ime(bool post_ime) {
-  post_ime_ = post_ime;
-}
-
-void InputMethodEventHandler::OnKeyEvent(ui::KeyEvent* event) {
-  // Ignore events being dispatched back to the delegate from the input method.
-  if (post_ime_)
-    return;
-
-  if (event->flags() & ui::EF_IS_SYNTHESIZED)
-    return;
-
-  input_method_->DispatchKeyEvent(event);
-  event->StopPropagation();
-}
-
-}  // namespace extensions