Bug 2064250 - Remove MockPermissionPrompt. r=jgraham

This is currently not used at all outside of a minor smoke test, which dates
to the B2G era. This testing facility also appears to date to the B2G era.
This uses a very old code pattern for restoring a component registration, which makes
me think that it was not used even back in 2019, when bug 1524687 landed and
cleaned up a lot of that. Let's just remove it.

Differential Revision: https://phabricator.services.mozilla.com/D319305

testing/mochitest/tests/Harness_sanity/test_SpecialPowersExtension.html

@@ -183,9 +183,6 @@ async function starttest(){
 
   info("\nProfile::SpecialPowersRunTime: " + (new Date() - startTime) + "\n");
 
-  // bug 855192
-  ok(SpecialPowers.MockPermissionPrompt, "check mock permission prompt");
-
   // Set a pref using pushPrefEnv to make sure that flushPrefEnv is
   // automatically called before we invoke
   // test_SpecialPowersExtension2.html.

testing/specialpowers/content/MockPermissionPrompt.sys.mjs

@@ -1,75 +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/. */
-
-const Cm = Components.manager;
-
-const CONTRACT_ID = "@mozilla.org/content-permission/prompt;1";
-
-var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
-var oldClassID, oldFactory;
-var newClassID = Services.uuid.generateUUID();
-var newFactory = {
-  createInstance(aIID) {
-    return new MockPermissionPromptInstance().QueryInterface(aIID);
-  },
-  QueryInterface: ChromeUtils.generateQI(["nsIFactory"]),
-};
-
-export var MockPermissionPrompt = {
-  init() {
-    this.reset();
-    if (!registrar.isCIDRegistered(newClassID)) {
-      try {
-        oldClassID = registrar.contractIDToCID(CONTRACT_ID);
-        oldFactory = Cm.getClassObject(Cc[CONTRACT_ID], Ci.nsIFactory);
-      } catch (ex) {
-        oldClassID = "";
-        oldFactory = null;
-        dump(
-          "TEST-INFO | can't get permission prompt registered component, " +
-            "assuming there is none"
-        );
-      }
-      if (oldFactory) {
-        registrar.unregisterFactory(oldClassID, oldFactory);
-      }
-      registrar.registerFactory(newClassID, "", CONTRACT_ID, newFactory);
-    }
-  },
-
-  reset() {},
-
-  cleanup() {
-    this.reset();
-    if (oldFactory) {
-      registrar.unregisterFactory(newClassID, newFactory);
-      registrar.registerFactory(oldClassID, "", CONTRACT_ID, oldFactory);
-    }
-  },
-};
-
-function MockPermissionPromptInstance() {}
-MockPermissionPromptInstance.prototype = {
-  QueryInterface: ChromeUtils.generateQI(["nsIContentPermissionPrompt"]),
-
-  promptResult: Ci.nsIPermissionManager.UNKNOWN_ACTION,
-
-  prompt(request) {
-    let perms = request.types.QueryInterface(Ci.nsIArray);
-    for (let idx = 0; idx < perms.length; idx++) {
-      let perm = perms.queryElementAt(idx, Ci.nsIContentPermissionType);
-      if (
-        Services.perms.testExactPermissionFromPrincipal(
-          request.principal,
-          perm.type
-        ) != Ci.nsIPermissionManager.ALLOW_ACTION
-      ) {
-        request.cancel();
-        return;
-      }
-    }
-
-    request.allow();
-  },
-};

testing/specialpowers/content/SpecialPowersChild.sys.mjs

@@ -12,8 +12,6 @@ ChromeUtils.defineESModuleGetters(lazy, {
   ContentTaskUtils: "resource://testing-common/ContentTaskUtils.sys.mjs",
   MockColorPicker: "resource://testing-common/MockColorPicker.sys.mjs",
   MockFilePicker: "resource://testing-common/MockFilePicker.sys.mjs",
-  MockPermissionPrompt:
-    "resource://testing-common/MockPermissionPrompt.sys.mjs",
   MockPromptCollection:
     "resource://testing-common/MockPromptCollection.sys.mjs",
   MockSound: "resource://testing-common/MockSound.sys.mjs",
@@ -449,10 +447,6 @@ export class SpecialPowersChild extends JSWindowActorChild {
     return lazy.MockPromptCollection;
   }
 
-  get MockPermissionPrompt() {
-    return lazy.MockPermissionPrompt;
-  }
-
   get MockSound() {
     return lazy.MockSound;
   }

testing/specialpowers/moz.build

@@ -23,7 +23,6 @@ modules = [
     "content/ContentTaskUtils.sys.mjs",
     "content/MockColorPicker.sys.mjs",
     "content/MockFilePicker.sys.mjs",
-    "content/MockPermissionPrompt.sys.mjs",
     "content/MockPromptCollection.sys.mjs",
     "content/MockSound.sys.mjs",
     "content/SpecialPowersChild.sys.mjs",