Backed out 2 changesets (bug 1263887) for m(oth) and m-e10s(bc7) failures

Backed out changeset c0730eb0c5fc (bug 1263887)
Backed out changeset 3c2a87839422 (bug 1263887)

MozReview-Commit-ID: GDPDmfE5J7d

toolkit/content/widgets/menulist.xml

@@ -254,10 +254,6 @@
             event.initEvent("ValueChange", true, true);
             this.dispatchEvent(event);
 
-            if (this.menuBoxObject) {
-              this.menuBoxObject.activeChild = this.mSelectedInternal;
-            }
-
             return val;
           ]]>
         </setter>

toolkit/modules/SelectContentHelper.jsm

@@ -14,8 +14,6 @@ XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
                                   "resource://gre/modules/BrowserUtils.jsm");
 XPCOMUtils.defineLazyServiceGetter(this, "DOMUtils",
                                    "@mozilla.org/inspector/dom-utils;1", "inIDOMUtils");
-XPCOMUtils.defineLazyModuleGetter(this, "DeferredTask",
-                                  "resource://gre/modules/DeferredTask.jsm");
 
 const kStateHover = 0x00000004; // NS_EVENT_STATE_HOVER
 
@@ -29,7 +27,6 @@ this.SelectContentHelper = function (aElement, aGlobal) {
   this.global = aGlobal;
   this.init();
   this.showDropDown();
-  this._updateTimer = new DeferredTask(this._update.bind(this), 0);
 }
 
 this.SelectContentHelper.prototype = {
@@ -39,14 +36,7 @@ this.SelectContentHelper.prototype = {
     this.global.addMessageListener("Forms:MouseOver", this);
     this.global.addMessageListener("Forms:MouseOut", this);
     this.global.addEventListener("pagehide", this);
-    let MutationObserver = this.element.ownerDocument.defaultView.MutationObserver;
-    this.mut = new MutationObserver(mutations => {
-      // Something changed the <select> while it was open, so
-      // we'll poke a DeferredTask to update the parent sometime
-      // in the very near future.
-      this._updateTimer.arm();
-    });
-    this.mut.observe(this.element, {childList: true, subtree: true});
+    this.global.addEventListener("mozhidedropdown", this);
   },
 
   uninit: function() {
@@ -55,11 +45,9 @@ this.SelectContentHelper.prototype = {
     this.global.removeMessageListener("Forms:MouseOver", this);
     this.global.removeMessageListener("Forms:MouseOut", this);
     this.global.removeEventListener("pagehide", this);
+    this.global.removeEventListener("mozhidedropdown", this);
     this.element = null;
     this.global = null;
-    this.mut.disconnect();
-    this._updateTimer.disarm();
-    this._updateTimer = null;
   },
 
   showDropDown: function() {
@@ -81,15 +69,6 @@ this.SelectContentHelper.prototype = {
     return buildOptionListForChildren(this.element);
   },
 
-  _update() {
-    // The <select> was updated while the dropdown was open.
-    // Let's send up a new list of options.
-    this.global.sendAsyncMessage("Forms:UpdateDropDown", {
-      options: this._buildOptionList(),
-      selectedIndex: this.element.selectedIndex,
-    });
-  },
-
   receiveMessage: function(message) {
     switch (message.name) {
       case "Forms:SelectDropDownItem":

toolkit/modules/SelectParentHelper.jsm

@@ -9,22 +9,18 @@ this.EXPORTED_SYMBOLS = [
 ];
 
 var currentBrowser = null;
-var currentMenulist = null;
-var currentZoom = 1;
 
 this.SelectParentHelper = {
   populate: function(menulist, items, selectedIndex, zoom) {
     // Clear the current contents of the popup
     menulist.menupopup.textContent = "";
-    currentZoom = zoom;
-    currentMenulist = menulist;
     populateChildren(menulist, items, selectedIndex, zoom);
   },
 
   open: function(browser, menulist, rect) {
     menulist.hidden = false;
     currentBrowser = browser;
-    this._registerListeners(browser, menulist.menupopup);
+    this._registerListeners(menulist.menupopup);
 
     menulist.menupopup.openPopupAtScreenRect("after_start", rect.left, rect.top, rect.width, rect.height, false, false);
     menulist.selectedItem.scrollIntoView();
@@ -56,44 +52,26 @@ this.SelectParentHelper = {
 
       case "popuphidden":
         currentBrowser.messageManager.sendAsyncMessage("Forms:DismissedDropDown", {});
-        let popup = event.target;
-        this._unregisterListeners(currentBrowser, popup);
-        popup.parentNode.hidden = true;
         currentBrowser = null;
-        currentMenulist = null;
-        currentZoom = 1;
+        let popup = event.target;
+        this._unregisterListeners(popup);
+        popup.parentNode.hidden = true;
         break;
     }
   },
 
-  receiveMessage(msg) {
-    if (msg.name == "Forms:UpdateDropDown") {
-      // Sanity check - we'd better know what the currently
-      // opened menulist is, and what browser it belongs to...
-      if (!currentMenulist || !currentBrowser) {
-        return;
-      }
-
-      let options = msg.data.options;
-      let selectedIndex = msg.data.selectedIndex;
-      this.populate(currentMenulist, options, selectedIndex, currentZoom);
-    }
-  },
-
-  _registerListeners: function(browser, popup) {
+  _registerListeners: function(popup) {
     popup.addEventListener("command", this);
     popup.addEventListener("popuphidden", this);
     popup.addEventListener("mouseover", this);
     popup.addEventListener("mouseout", this);
-    browser.messageManager.addMessageListener("Forms:UpdateDropDown", this);
   },
 
-  _unregisterListeners: function(browser, popup) {
+  _unregisterListeners: function(popup) {
     popup.removeEventListener("command", this);
     popup.removeEventListener("popuphidden", this);
     popup.removeEventListener("mouseover", this);
     popup.removeEventListener("mouseout", this);
-    browser.messageManager.removeMessageListener("Forms:UpdateDropDown", this);
   },
 
 };