1 files changed, 0 insertions, 185 deletions
diff --git a/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/navigation_history.js b/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/navigation_history.js
deleted file mode 100644
index 968564cdc27..00000000000
--- a/chromium/chrome/browser/resources/chromeos/chromevox/chromevox/injected/navigation_history.js
+++ /dev/null
@@ -1,185 +0,0 @@
-// Copyright 2014 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.
-
-/**
- * @fileoverview Navigation history tracks recently visited nodes. The
- * state of this class (the node history), is used to ensure the user is
- * navigating to and from valid nodes.
- * NOTE: The term "valid node" is simply a heuristic, defined in isValidNode_.
- *
- */
-
-
-goog.provide('cvox.NavigationHistory');
-
-goog.require('cvox.DomUtil');
-
-
-/**
- * @constructor
- */
-cvox.NavigationHistory = function() {
-  this.reset_();
-};
-
-
-/**
- * The maximum length of history tracked for recently visited nodes.
- * @const
- * @type {number}
- * @private
- */
-cvox.NavigationHistory.MAX_HISTORY_LEN_ = 30;
-
-
-/**
- * Resets the navigation history.
- * @private
- */
-cvox.NavigationHistory.prototype.reset_ = function() {
-  var startNode = document.body;
-
-  /**
-   * An array of nodes ordered from newest to oldest in the history.
-   * The most recent nodes are at the start of the array.
-   * @type {Array<Node>}
-   * @private
-   */
-  this.history_ = [startNode];
-
-  /**
-   * A flag to keep track of whether the last node added to the history was
-   * valid or not. If false, something strange might be going on, and we
-   * can react to this in the code.
-   * @type {boolean}
-   * @private
-   */
-  this.arrivedValid_ = true;
-
-};
-
-
-/**
- * Update the navigation history with the current element.
- * The most recent elements are at the start of the array.
- * @param {Node} newNode The new node to update the history with.
- */
-cvox.NavigationHistory.prototype.update = function(newNode) {
-  var previousNode = this.history_[0];
-
-  // Avoid pushing consecutive duplicate elements.
-  if (newNode && newNode != previousNode) {
-    this.history_.unshift(newNode);
-  }
-
-  // If list is too long, pop the last (oldest) item.
-  if (this.history_.length >
-      cvox.NavigationHistory.MAX_HISTORY_LEN_) {
-    this.history_.pop();
-  }
-
-  // Check if the node is valid upon arrival. If not, set a flag because
-  // something fishy is probably going on.
-  this.arrivedValid_ = this.isValidNode_(newNode);
-};
-
-
-/**
- * Routinely clean out history and determine if the given node has become
- * invalid since we arrived there (during the update call). If the node
- * was already invalid, we will return false.
- * @param {Node} node The node to check for validity change.
- * @return {boolean} True if node changed state to invalid.
- */
-cvox.NavigationHistory.prototype.becomeInvalid = function(node) {
-  // Remove any invalid nodes from history_.
-  this.clean_();
-
-  // If node was somehow already invalid on arrival, the page was probably
-  // changing very quickly. Be defensive here and allow the default
-  // navigation action by returning true.
-  if (!this.arrivedValid_) {
-    this.arrivedValid_ = true; // Reset flag.
-    return false;
-  }
-
-  // Run the validation method on the given node.
-  return !this.isValidNode_(node);
-};
-
-
-/**
- * Determine a valid reversion for the current navigation track. A reversion
- * provides both a current node to sync to and a previous node as context.
- * @param {function(Node)=} opt_predicate A function that takes in a node and
- *     returns true if it is a valid recovery candidate. Nodes that do not
- *     match the predicate are removed as we search for a match. If no
- *     predicate is provided, return the two most recent nodes.
- * @return {{current: ?Node, previous: ?Node}}
- *     The two nodes to override default navigation behavior with. Returning
- *     null or undefined means the history is empty.
- */
-cvox.NavigationHistory.prototype.revert = function(opt_predicate) {
-  // If the currently active element is valid, it is probably the best
-  // recovery target. Add it to the history before computing the reversion.
-  var active = document.activeElement;
-  if (active != document.body && this.isValidNode_(active)) {
-    this.update(active);
-  }
-
-  // Remove the most-recent-nodes that do not match the predicate.
-  if (opt_predicate) {
-    while (this.history_.length > 0) {
-      var node = this.history_[0];
-      if (opt_predicate(node)) {
-        break;
-      }
-      this.history_.shift();
-    }
-  }
-
-  // The reversion is just the first two nodes in the history.
-  return {current: this.history_[0], previous: this.history_[1]};
-};
-
-
-/**
- * Remove any and all nodes from history_ that are no longer valid.
- * @return {boolean} True if any changes were made to the history.
- * @private
- */
-cvox.NavigationHistory.prototype.clean_ = function() {
-  var changed = false;
-  for (var i = this.history_.length - 1; i >= 0; i--) {
-    var valid = this.isValidNode_(this.history_[i]);
-    if (!valid) {
-      this.history_.splice(i, 1);
-      changed = true;
-    }
-  }
-  return changed;
-};
-
-
-/**
- * Determine if the given node is valid based on a heuristic.
- * A valid node must be attached to the DOM and visible.
- * @param {Node} node The node to validate.
- * @return {boolean} True if node is valid.
- * @private
- */
-cvox.NavigationHistory.prototype.isValidNode_ = function(node) {
-  // Confirm that the element is in the DOM.
-  if (!cvox.DomUtil.isAttachedToDocument(node)) {
-    return false;
-  }
-
-  // TODO (adu): In the future we may change this to just let users know the
-  // node is invisible instead of restoring focus.
-  if (!cvox.DomUtil.isVisible(node)) {
-    return false;
-  }
-
-  return true;
-};