Backed out changeset 9c966265dc48 (bug 1383367)

MozReview-Commit-ID: HW5syKq18xj

toolkit/modules/BrowserUtils.jsm

@@ -16,48 +16,6 @@ XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
 
 Cu.importGlobalProperties(["URL"]);
 
-let reflowObservers = new WeakMap();
-
-function ReflowObserver(doc) {
-  this._doc = doc;
-
-  doc.docShell.addWeakReflowObserver(this);
-  reflowObservers.set(this._doc, this);
-
-  this.callbacks = [];
-}
-
-ReflowObserver.prototype = {
-  QueryInterface: XPCOMUtils.generateQI(["nsIReflowObserver", "nsISupportsWeakReference"]),
-
-  _onReflow() {
-    reflowObservers.delete(this._doc);
-    this._doc.docShell.removeWeakReflowObserver(this);
-
-    for (let callback of this.callbacks) {
-      try {
-        callback();
-      } catch (e) {
-        Cu.reportError(e);
-      }
-    }
-  },
-
-  reflow() {
-    this._onReflow();
-  },
-
-  reflowInterruptible() {
-    this._onReflow();
-  },
-};
-
-const FLUSH_TYPES = {
-  "style": Ci.nsIDOMWindowUtils.FLUSH_STYLE,
-  "layout": Ci.nsIDOMWindowUtils.FLUSH_LAYOUT,
-  "display": Ci.nsIDOMWindowUtils.FLUSH_DISPLAY,
-};
-
 this.BrowserUtils = {
 
   /**
@@ -668,63 +626,4 @@ this.BrowserUtils = {
     }
     return [url, postData];
   },
-
-  /**
-   * Calls the given function when the given document has just reflowed,
-   * and returns a promise which resolves to its return value after it
-   * has been called.
-   *
-   * The function *must not trigger any reflows*, or make any changes
-   * which would require a layout flush.
-   *
-   * @param {Document} doc
-   * @param {function} callback
-   * @returns {Promise}
-   */
-  promiseReflowed(doc, callback) {
-    let observer = reflowObservers.get(doc);
-    if (!observer) {
-      observer = new ReflowObserver(doc);
-      reflowObservers.set(doc, observer);
-    }
-
-    return new Promise((resolve, reject) => {
-      observer.callbacks.push(() => {
-        try {
-          resolve(callback());
-        } catch (e) {
-          reject(e);
-        }
-      });
-    });
-  },
-
-  /**
-   * Calls the given function as soon as a layout flush of the given
-   * type is not necessary, and returns a promise which resolves to the
-   * callback's return value after it executes.
-   *
-   * The function *must not trigger any reflows*, or make any changes
-   * which would require a layout flush.
-   *
-   * @param {Document} doc
-   * @param {string} flushType
-   *        The flush type required. Must be one of:
-   *
-   *          - "style"
-   *          - "layout"
-   *          - "display"
-   * @param {function} callback
-   * @returns {Promise}
-   */
-  async promiseLayoutFlushed(doc, flushType, callback) {
-    let utils = doc.defaultView.QueryInterface(Ci.nsIInterfaceRequestor)
-                   .getInterface(Ci.nsIDOMWindowUtils);
-
-    if (!utils.needsFlush(FLUSH_TYPES[flushType])) {
-      return callback();
-    }
-
-    return this.promiseReflowed(doc, callback);
-  },
 };