Remove the old task manager view

chrome/browser/task_manager/task_manager_tester_nonmac.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 "chrome/browser/task_management/task_manager_tester.h"
+
+#include "chrome/browser/task_management/task_manager_interface.h"
+
+// TODO(tapted): Delete this file and rename CreateDefault() to Create() when
+// there is no longer a legacy task manager.
+
+namespace task_management {
+
+std::unique_ptr<TaskManagerTester> TaskManagerTester::Create(
+    const base::Closure& callback) {
+#if defined(OS_MACOSX)
+  // This Create() method doesn't attempt to create a tester for the legacy
+  // interface, so disabling the new task manager on Mac have no effect.
+  DCHECK(TaskManagerInterface::IsNewTaskManagerEnabled());
+#endif
+  return TaskManagerTester::CreateDefault(callback);
+}
+
+void TaskManagerTester::MaybeRefreshLegacyInstance() {
+#if defined(OS_MACOSX)
+  DCHECK(TaskManagerInterface::IsNewTaskManagerEnabled());
+#endif
+}
+
+}  // namespace task_management