Remove the old task manager view

chrome/browser/task_management/task_manager_tester.h

 // 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.
 
 #ifndef CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_TESTER_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_TESTER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/task_management/task_manager_browsertest_util.h"
 
 namespace task_management {
 
 // An adapter that abstracts away the difference of old vs. new task manager.
 class TaskManagerTester {
  public:
   using ColumnSpecifier = browsertest_util::ColumnSpecifier;
 
   // Creates a TaskManagerTester backed by the current task manager. The task
   // manager should already be visible when you call this function. |callback|,
   // if not a null callback, will be invoked when the underlying model changes.
   static std::unique_ptr<TaskManagerTester> Create(
       const base::Closure& callback);
 
+  // If using a legacy task manager, refresh the model.
+  static void MaybeRefreshLegacyInstance();
+
   virtual ~TaskManagerTester() {}
 
   // Get the number of rows currently in the task manager.
   virtual int GetRowCount() = 0;
 
   // Get the title text of a particular |row|.
   virtual base::string16 GetRowTitle(int row) = 0;
 
   // Hide or show a column. If a column is not visible its stats are not
   // necessarily gathered.
   virtual void ToggleColumnVisibility(ColumnSpecifier column) = 0;
 
   // Get the value of a column as an int64. Memory values are in bytes.
   virtual int64_t GetColumnValue(ColumnSpecifier column, int row) = 0;
 
   // If |row| is associated with a WebContents, return its SessionID. Otherwise,
   // return -1.
   virtual int32_t GetTabId(int row) = 0;
 
   // Kill the process of |row|.
   virtual void Kill(int row) = 0;
+
+ private:
+  // Always creates a tester for the non-legacy TaskManager.
+  static std::unique_ptr<TaskManagerTester> CreateDefault(
+      const base::Closure& callback);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_TESTER_H_