Bug 1886821 - [remote] Cleanup Dialog class after removal of old modal implementation r=webdriver-reviewers,whimboo

We no longer need the curBrowserFn to build the Dialog instance, so we can simplify the implementation

Differential Revision: https://phabricator.services.mozilla.com/D205348

remote/shared/Prompt.sys.mjs

@@ -42,7 +42,7 @@ modal.findPrompt = function (context) {
       win.opener === context.window
     ) {
       lazy.logger.trace("Found open window modal prompt");
-      return new modal.Dialog(() => context, win);
+      return new modal.Dialog(win);
     }
   }
 
@@ -51,7 +51,7 @@ modal.findPrompt = function (context) {
     if (geckoViewPrompts.length) {
       lazy.logger.trace("Found open GeckoView prompt");
       const prompt = geckoViewPrompts[0];
-      return new modal.Dialog(() => context, prompt);
+      return new modal.Dialog(prompt);
     }
   }
 
@@ -65,7 +65,7 @@ modal.findPrompt = function (context) {
     let dialogs = contentBrowser.tabDialogBox.getTabDialogManager().dialogs;
     if (dialogs.length) {
       lazy.logger.trace("Found open tab modal prompt");
-      return new modal.Dialog(() => context, dialogs[0].frameContentWindow);
+      return new modal.Dialog(dialogs[0].frameContentWindow);
     }
 
     dialogs = contentBrowser.tabDialogBox.getContentDialogManager().dialogs;
@@ -74,7 +74,7 @@ modal.findPrompt = function (context) {
     // gets lazily added. If it's not set yet, ignore the dialog for now.
     if (dialogs.length && dialogs[0].frameContentWindow.Dialog) {
       lazy.logger.trace("Found open content prompt");
-      return new modal.Dialog(() => context, dialogs[0].frameContentWindow);
+      return new modal.Dialog(dialogs[0].frameContentWindow);
     }
   }
   return null;
@@ -83,15 +83,14 @@ modal.findPrompt = function (context) {
 /**
  * Represents a modal dialog.
  *
- * @param {function(): browser.Context} curBrowserFn
- *     Function that returns the current |browser.Context|.
  * @param {DOMWindow} dialog
  *     DOMWindow of the dialog.
  */
 modal.Dialog = class {
-  constructor(curBrowserFn, dialog) {
-    this.curBrowserFn_ = curBrowserFn;
-    this.win_ = Cu.getWeakReference(dialog);
+  #win;
+
+  constructor(dialog) {
+    this.#win = Cu.getWeakReference(dialog);
   }
 
   get args() {
@@ -102,10 +101,6 @@ modal.Dialog = class {
     return tm ? tm.args : null;
   }
 
-  get curBrowser_() {
-    return this.curBrowserFn_();
-  }
-
   get isOpen() {
     if (lazy.AppInfo.isAndroid) {
       return this.window !== null;
@@ -148,8 +143,8 @@ modal.Dialog = class {
    * it is currently attached to the DOM.
    */
   get window() {
-    if (this.win_) {
-      let win = this.win_.get();
+    if (this.#win) {
+      let win = this.#win.get();
       if (win && (lazy.AppInfo.isAndroid || win.parent)) {
         return win;
       }

remote/shared/listeners/PromptListener.sys.mjs

@@ -172,7 +172,7 @@ export class PromptListener {
         }
         this.emit("opened", {
           contentBrowser: curBrowser.contentBrowser,
-          prompt: new lazy.modal.Dialog(() => curBrowser, subject),
+          prompt: new lazy.modal.Dialog(subject),
         });
 
         break;
@@ -190,7 +190,6 @@ export class PromptListener {
             // the selected tab.
             const tab = tabBrowser.selectedTab;
             const contentBrowser = lazy.TabManager.getBrowserForTab(tab);
-            const window = lazy.TabManager.getWindowForTab(tab);
 
             // Do not send the event if the curBrowser is specified,
             // and it's different from prompt browser.
@@ -200,13 +199,7 @@ export class PromptListener {
 
             this.emit("opened", {
               contentBrowser,
-              prompt: new lazy.modal.Dialog(
-                () => ({
-                  contentBrowser,
-                  window,
-                }),
-                prompt
-              ),
+              prompt: new lazy.modal.Dialog(prompt),
             });
             return;
           }