1 files changed, 0 insertions, 163 deletions
diff --git a/browser/components/sessionstore/TabStateCache.jsm b/browser/components/sessionstore/TabStateCache.jsm
deleted file mode 100644
index 9bed315a0..000000000
--- a/browser/components/sessionstore/TabStateCache.jsm
+++ /dev/null
@@ -1,163 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-this.EXPORTED_SYMBOLS = ["TabStateCache"];
-
-/**
- * A cache for tabs data.
- *
- * This cache implements a weak map from tabs (as XUL elements)
- * to tab data (as objects).
- *
- * Note that we should never cache private data, as:
- * - that data is used very seldom by SessionStore;
- * - caching private data in addition to public data is memory consuming.
- */
-this.TabStateCache = Object.freeze({
-  /**
-   * Retrieves cached data for a given |tab| or associated |browser|.
-   *
-   * @param browserOrTab (xul:tab or xul:browser)
-   *        The tab or browser to retrieve cached data for.
-   * @return (object)
-   *         The cached data stored for the given |tab|
-   *         or associated |browser|.
-   */
-  get: function (browserOrTab) {
-    return TabStateCacheInternal.get(browserOrTab);
-  },
-
-  /**
-   * Updates cached data for a given |tab| or associated |browser|.
-   *
-   * @param browserOrTab (xul:tab or xul:browser)
-   *        The tab or browser belonging to the given tab data.
-   * @param newData (object)
-   *        The new data to be stored for the given |tab|
-   *        or associated |browser|.
-   */
-  update: function (browserOrTab, newData) {
-    TabStateCacheInternal.update(browserOrTab, newData);
-  }
-});
-
-var TabStateCacheInternal = {
-  _data: new WeakMap(),
-
-  /**
-   * Retrieves cached data for a given |tab| or associated |browser|.
-   *
-   * @param browserOrTab (xul:tab or xul:browser)
-   *        The tab or browser to retrieve cached data for.
-   * @return (object)
-   *         The cached data stored for the given |tab|
-   *         or associated |browser|.
-   */
-  get: function (browserOrTab) {
-    return this._data.get(browserOrTab.permanentKey);
-  },
-
-  /**
-   * Helper function used by update (see below). For message size
-   * optimization sometimes we don't update the whole session storage
-   * only the values that have been changed.
-   *
-   * @param data (object)
-   *        The cached data where we want to update the changes.
-   * @param change (object)
-   *        The actual changed values per domain.
-   */
-  updatePartialStorageChange: function (data, change) {
-    if (!data.storage) {
-      data.storage = {};
-    }
-
-    let storage = data.storage;
-    for (let domain of Object.keys(change)) {
-      for (let key of Object.keys(change[domain])) {
-        let value = change[domain][key];
-        if (value === null) {
-          if (storage[domain] && storage[domain][key]) {
-            delete storage[domain][key];
-          }
-        } else {
-          if (!storage[domain]) {
-            storage[domain] = {};
-          }
-          storage[domain][key] = value;
-        }
-      }
-    }
-  },
-
-  /**
-   * Helper function used by update (see below). For message size
-   * optimization sometimes we don't update the whole browser history
-   * only the current index and the tail of the history from a certain
-   * index (specified by change.fromIdx)
-   *
-   * @param data (object)
-   *        The cached data where we want to update the changes.
-   * @param change (object)
-   *        Object containing the tail of the history array, and
-   *        some additional metadata.
-   */
-  updatePartialHistoryChange: function (data, change) {
-    const kLastIndex = Number.MAX_SAFE_INTEGER - 1;
-
-    if (!data.history) {
-      data.history = { entries: [] };
-    }
-
-    let history = data.history;
-    for (let key of Object.keys(change)) {
-      if (key == "entries") {
-        if (change.fromIdx != kLastIndex) {
-          history.entries.splice(change.fromIdx + 1);
-          while (change.entries.length) {
-            history.entries.push(change.entries.shift());
-          }
-        }
-      } else if (key != "fromIndex") {
-        history[key] = change[key];
-      }
-    }
-  },
-
-  /**
-   * Updates cached data for a given |tab| or associated |browser|.
-   *
-   * @param browserOrTab (xul:tab or xul:browser)
-   *        The tab or browser belonging to the given tab data.
-   * @param newData (object)
-   *        The new data to be stored for the given |tab|
-   *        or associated |browser|.
-   */
-  update: function (browserOrTab, newData) {
-    let data = this._data.get(browserOrTab.permanentKey) || {};
-
-    for (let key of Object.keys(newData)) {
-      if (key == "storagechange") {
-        this.updatePartialStorageChange(data, newData.storagechange);
-        continue;
-      }
-
-      if (key == "historychange") {
-        this.updatePartialHistoryChange(data, newData.historychange);
-        continue;
-      }
-
-      let value = newData[key];
-      if (value === null) {
-        delete data[key];
-      } else {
-        data[key] = value;
-      }
-    }
-
-    this._data.set(browserOrTab.permanentKey, data);
-  }
-};