Bug 1254865 - Send init for AutoCompletePopup in async message from the parent. r=Felipe

MozReview-Commit-ID: IZ9f8pTTflF

--HG--
extra : rebase_source : 77d97d6ceec1aac296788a702c96288507608c7d

toolkit/content/browser-child.js

@@ -632,9 +632,10 @@ addMessageListener("PermitUnload", msg => {
 var outerWindowID = content.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils)
                            .outerWindowID;
-var initData = sendSyncMessage("Browser:Init", {outerWindowID: outerWindowID});
-if (initData.length && initData[0]) {
-  if (initData[0].initPopup) {
-    setTimeout(() => AutoCompletePopup.init(), 0);
+sendAsyncMessage("Browser:Init", {outerWindowID: outerWindowID});
+addMessageListener("Browser:InitReceived", function onInitReceived(msg) {
+  removeMessageListener("Browser:InitReceived", onInitReceived);
+  if (msg.data.initPopup) {
+    AutoCompletePopup.init();
   }
-}
+});

toolkit/content/widgets/remote-browser.xml

@@ -430,9 +430,9 @@
           switch (aMessage.name) {
             case "Browser:Init":
               this._outerWindowID = data.outerWindowID;
-              let result = {};
-              result.initPopup = this.autoCompletePopup != null;
-              return result;
+              this.messageManager.sendAsyncMessage("Browser:InitReceived", {
+                initPopup: this.autoCompletePopup != null,
+              });
               break;
             case "DOMTitleChanged":
               this._contentTitle = data.title;