Delete the WebUI implementation of the task manager.

chrome/browser/resources/task_manager/preload.js

-// 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.
-
-// Defines global variables.
-var commands = TaskManagerCommands;
-var taskmanager = undefined;  // This will be instantiated in main.js.
-
-/**
- * Invoked when a range of items has changed.
- * @param {Integer} start The start position of tasks to be changed
- * @param {Integer} length The length of tasks to be changed
- * @param {Array of task} tasks The array of updated task
- */
-function taskChanged(start, length, tasks) {
-  var task = {type: 'change', start: start, length: length, tasks: tasks};
-
-  if (taskmanager) taskmanager.processTaskChange(task);
-}
-
-// Cached list of enabled columns to prevent frequent access to localStorage.
-var cachedEnabledColumns;
-
-/**
- * @return {Dictionary} the dictionary which contains the list of columns and
- * whether each column is enabled or not.
- */
-function getEnabledColumns() {
-  // Use the cache after the second time since access to localStorage is slow.
-  if (cachedEnabledColumns)
-    return cachedEnabledColumns;
-
-  var json = window.localStorage.getItem(ENABLED_COLUMNS_KEY);
-  try {
-    cachedEnabledColumns = JSON.parse(json) || {};
-  } catch (e) {
-    cachedEnabledColumns = {};
-  }
-  for (var i = 0; i < DEFAULT_COLUMNS.length; i++) {
-    if (typeof(cachedEnabledColumns[DEFAULT_COLUMNS[i][0]]) == 'undefined')
-      cachedEnabledColumns[DEFAULT_COLUMNS[i][0]] = DEFAULT_COLUMNS[i][3];
-  }
-  return cachedEnabledColumns;
-}
-
-/**
- * @return {boolean} the given column (at |columnId|) is enabled or not.
- * @param {string} columnId The ID of the collumn to be checked.
- */
-function isColumnEnabled(columnId) {
-  return (getEnabledColumns())[columnId];
-}
-
-/**
- * Sets the given column either enabled or disabled.
- * @param {string} columnId The ID of the collumn to be set.
- * @param {boolean} newChecked True, to set the column enable. False otherwise.
- */
-function setColumnEnabled(columnId, newChecked) {
-  commands.setUpdateColumn(columnId, newChecked);
-  cachedEnabledColumns[columnId] = newChecked;
-  var json = JSON.stringify(cachedEnabledColumns);
-  window.localStorage.setItem(ENABLED_COLUMNS_KEY, json);
-}
-
-// Enable the taskmanager model before the loading of scripts.
-(function() {
-  for (var i = 0; i < DEFAULT_COLUMNS.length; i++) {
-    var columnId = DEFAULT_COLUMNS[i][0];
-    if (isColumnEnabled(columnId))
-      commands.setUpdateColumn(columnId, true);
-  }
-  commands.enableTaskManager();
-  commands.setUpdateColumn('canInspect', true);
-  commands.setUpdateColumn('canActivate', true);
-})();