[Part 5 of 6] Move TaskManagerTester to the task_management directory.

chrome/browser/task_manager/legacy_task_manager_tester.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_manager/legacy_task_manager_tester.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/task_manager/resource_provider.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/grit/generated_resources.h"
 #include "extensions/strings/grit/extensions_strings.h"
 
-using ColumnSpecifier = task_manager::browsertest_util::ColumnSpecifier;
-
 namespace task_manager {
 
-class LegacyTaskManagerTester : public browsertest_util::TaskManagerTester,
+class LegacyTaskManagerTester : public task_management::TaskManagerTester,
                                 public TaskManagerModelObserver {
  public:
   explicit LegacyTaskManagerTester(const base::Closure& on_resource_change)
       : on_resource_change_(on_resource_change),
         model_(TaskManager::GetInstance()->model()) {
     if (!on_resource_change_.is_null())
       model_->AddObserver(this);
   }
   ~LegacyTaskManagerTester() override {
     if (!on_resource_change_.is_null())
@@ skipping 50 matching lines @@
 
  private:
   void OnResourceChange() {
     if (!on_resource_change_.is_null())
       on_resource_change_.Run();
   }
   base::Closure on_resource_change_;
   TaskManagerModel* model_;
 };
 
-std::unique_ptr<browsertest_util::TaskManagerTester>
+std::unique_ptr<task_management::TaskManagerTester>
 CreateLegacyTaskManagerTester(const base::Closure& callback) {
   return base::WrapUnique(new LegacyTaskManagerTester(callback));
 }
 
 }  // namespace task_manager