Remove the last of the old samples.

chrome/test/data/extensions/samples/youtube_popular/map.js

-/**
- * @fileoverview This file contains js create a helper Map object
- * @author lzheng@chromium.com (Lei Zheng)
- */
-
-/**
- * A Map class that implemeted using two arrays.
- */
-Map = function() {
-  /**
-   * Array that hold all Keys.
-   * @private
-   */
-  this.keysArray = []; // Keys
-  /**
-   * Array that hold all values.
-   * @private
-   */
-  this.valsArray = []; // Values
-
-  /**
-   * Index of where to insert new entries in key and value array.
-   * @private
-   */
-  this.mapIndex_ = 0;
-};
-
-/**
- * Insert a key, value pair to map.
- * @param {object} key An object that supports "==".
- * @param {object} value The entry in map.
- */
-Map.prototype.insert = function(key, value) {
-  var index = this.findIndex(key);
-  if (index == -1)  {
-    this.keysArray[this.mapIndex_] = key;
-    this.valsArray[this.mapIndex_] = value;
-    ++this.mapIndex_;
-  }
-  else {
-    this.valsArray[index] = value;
-  }
-};
-
-/**
- * Get the entry associated with a key.
- * @param {object} key for the entry.
- * @return {object} The entry in map.
- */
-Map.prototype.keys = function() {
-  return this.keysArray;
-};
-
-/**
- * Get the entry associated with a key.
- * @param {object} key for the entry.
- * @return {object} The entry in map.
- */
-Map.prototype.get = function(key) {
-  var index = this.findIndex(key);
-  if (index != -1) {
-    return this.valsArray[index];
-  }
-  return null;
-};
-
-
-
-/**
- * Remove an entry associated with a key.
- * @param {object} key for the entry.
- */
-Map.prototype.remove = function(key) {
-  var index = this.findIndex(key);
-  if (index != -1) {
-    this.keysArray = this.removeFromArray(keysArray, index);
-    this.valsArray = this.removeFromAarry(valsArray, index);
-    --this.mapIndex_;
-  }
-  return;
-};
-
-/**
- * Get the total entries in the map.
- * @return {int} The total number of entries.
- */
-Map.prototype.size = function() {
-  return this.mapIndex_;
-};
-
-/**
- * Clear up everything in the map.
- */
-Map.clear = function() {
-  this.mapIndex_ = 0;
-  this.keysArray = [];
-  this.valsArray = [];
-};
-
-/**
- * Find the index associated with a key.
- * @private
- * @param {object} key for the entry.
- * @return {int} The index of this entry.
- */
-Map.prototype.findIndex = function(key) {
-  var result = -1;
-  for (var i = 0; i < this.keysArray.length; i++) {
-    if (this.keysArray[i] == key) {
-      result = i;
-      break;
-    }
-  }
-  return result;
-};
-
-/**
- * @private
- * Remove an entry from the map.
- * @param {int} index The index of the entry.
- */
-Map.prototype.removeAt = function(array, index) {
-  var first_half = array.slice(0, index);
-  var second_half = array.slice(index + 1);
-  return first_half.concat(second_half);
-}