Remove Hung plugin detector

chrome/browser/hang_monitor/hung_plugin_action.h

-// Copyright (c) 2012 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_HANG_MONITOR_HUNG_PLUGIN_ACTION_H__
-#define CHROME_BROWSER_HANG_MONITOR_HUNG_PLUGIN_ACTION_H__
-
-#include "base/strings/string16.h"
-#include "chrome/browser/hang_monitor/hung_window_detector.h"
-
-// This class provides an implementation the
-// HungWindowDetector::HungWindowNotification callback interface.
-// It checks to see if the hung window belongs to a process different
-// from that of the browser process and, if so, it returns an action
-// of HungWindowNotification::HUNG_WINDOW_TERMINATE_PROCESS.
-// Note: We can write other action classes that implement the same
-// interface and switch the action done on hung plugins based on user
-// preferences.
-class HungPluginAction : public HungWindowDetector::HungWindowNotification {
- public:
-  HungPluginAction();
-  ~HungPluginAction();
-  // HungWindowNotification implementation
-  bool OnHungWindowDetected(HWND hung_window,
-                            HWND top_level_window,
-                            ActionOnHungWindow* action) override;
-
- protected:
-  void OnWindowResponsive(HWND window);
-
-  // The callback function for the SendMessageCallback API
-  static void CALLBACK HungWindowResponseCallback(HWND target_window,
-                                                  UINT message,
-                                                  ULONG_PTR data,
-                                                  LRESULT result);
-
-  static BOOL CALLBACK DismissMessageBox(HWND window, LPARAM ignore);
-
- protected:
-  bool GetPluginNameAndVersion(HWND plugin_window,
-                               DWORD browser_process_id,
-                               base::string16* plugin_name,
-                               base::string16* plugin_version);
-  // The currently hung plugin window that we are prompting the user about
-  HWND current_hung_plugin_window_;
-};
-
-#endif  // CHROME_BROWSER_HANG_MONITOR_HUNG_PLUGIN_ACTION_H__