Remove the old task manager view

chrome/browser/caps/generate_state_json.h

-// Copyright 2015 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_CAPS_GENERATE_STATE_JSON_H_
-#define CHROME_BROWSER_CAPS_GENERATE_STATE_JSON_H_
-
-#include "base/memory/ref_counted.h"
-
-class TaskManagerModel;
-
-namespace base {
-class File;
-}
-
-namespace caps {
-
-// Creates a JSON stream with the browser and system state and
-// sends it to |file| which in practice is a pipe.
-void GenerateStateJSON(
-    scoped_refptr<TaskManagerModel> model, base::File file);
-
-}
-
-#endif  // CHROME_BROWSER_CAPS_GENERATE_STATE_JSON_H_