Remove initProgressEvent() docs (#19021)

This has been removed from all browsers for more than 2 years.

BCD change: mdn/browser-compat-data#17171

files/en-us/_redirects.txt

@@ -9148,10 +9148,11 @@
 /en-US/docs/Web/API/PresentationConnectionClosedEvent	/en-US/docs/Web/API/PresentationConnectionCloseEvent
 /en-US/docs/Web/API/PresentationRequest/onconnectionavailable	/en-US/docs/Web/API/PresentationRequest
 /en-US/docs/Web/API/ProgressEvent.ProgressEvent	/en-US/docs/Web/API/ProgressEvent/ProgressEvent
-/en-US/docs/Web/API/ProgressEvent.initProgressEvent	/en-US/docs/Web/API/ProgressEvent/initProgressEvent
+/en-US/docs/Web/API/ProgressEvent.initProgressEvent	/en-US/docs/Web/API/ProgressEvent
 /en-US/docs/Web/API/ProgressEvent.lengthComputable	/en-US/docs/Web/API/ProgressEvent/lengthComputable
 /en-US/docs/Web/API/ProgressEvent.loaded	/en-US/docs/Web/API/ProgressEvent/loaded
 /en-US/docs/Web/API/ProgressEvent.total	/en-US/docs/Web/API/ProgressEvent/total
+/en-US/docs/Web/API/ProgressEvent/initProgressEvent	/en-US/docs/Web/API/ProgressEvent
 /en-US/docs/Web/API/Promise	/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
 /en-US/docs/Web/API/PromiseRejection	/en-US/docs/Web/API/PromiseRejectionEvent
 /en-US/docs/Web/API/PromiseRejection/PromiseRejection	/en-US/docs/Web/API/PromiseRejectionEvent/PromiseRejectionEvent

files/en-us/_wikihistory.json

@@ -63358,17 +63358,6 @@
       "teoli"
     ]
   },
-  "Web/API/ProgressEvent/initProgressEvent": {
-    "modified": "2020-10-15T21:24:39.953Z",
-    "contributors": [
-      "ddbeck",
-      "DomenicDenicola",
-      "abbycar",
-      "Sebastianz",
-      "fscholz",
-      "teoli"
-    ]
-  },
   "Web/API/ProgressEvent/lengthComputable": {
     "modified": "2020-10-15T21:24:39.609Z",
     "contributors": [

files/en-us/mozilla/firefox/releases/22/index.md

@@ -39,7 +39,7 @@ tags:
 - The properties `HTMLMediaElement.crossorigin` and `HTMLInputElement.inputmode` has been removed to match the spec in {{domxref("HTMLMediaElement.crossOrigin")}} and `HTMLInputElement.inputMode`, respectively ({{bug("847370")}} and {{bug("850346")}}).
 - WebRTC: the Media Stream API and Peer Connection API are now supported by default.
 - Web Components: the {{domxref("Document.register")}} method has been implemented ({{bug("783129")}}).
-- The {{domxref("ProgressEvent.initProgressEvent()")}} constructor method has been removed. Uses the standard constructor, {{domxref("ProgressEvent.ProgressEvent", "ProgressEvent()")}} to construct and initialize {{domxref("ProgressEvent")}} ({{bug("843489")}}).
+- The `ProgressEvent.initProgressEvent()` constructor method has been removed. Use the standard constructor, {{domxref("ProgressEvent.ProgressEvent", "ProgressEvent()")}} to construct and initialize {{domxref("ProgressEvent")}} ({{bug("843489")}}).
 - Manipulated data associated with a {{domxref("Element/cut_event", "cut")}}, {{domxref("Element/copy_event", "copy")}}, or {{domxref("Element/paste_event", "paste")}} event can now be accessed via the {{domxref("ClipboardEvent.clipboardData")}} property ({{bug("407983")}}).
 - The {{domxref("HTMLTimeElement")}} interface has been implemented ({{bug("629801")}}).
 - When a {{domxref("Worker")}} constructor is passed an invalid URL, it now throws {{domxref("DOMException")}} of type `SECURITY_ERR` ({{bug("587251")}}).

files/en-us/web/api/progressevent/index.md

@@ -34,10 +34,7 @@ _Also inherits properties from its parent {{domxref("Event")}}_.
 
 ## Methods
 
-_Also inherits methods from its parent {{domxref("Event")}}._
-
-- {{domxref("ProgressEvent.initProgressEvent()")}} {{deprecated_inline}} {{non-Standard_inline}}
-  - : Initializes a `ProgressEvent` created using the deprecated {{domxref("Document.createEvent()", "Document.createEvent('ProgressEvent')")}} method.
+_Inherits methods from its parent, {{domxref("Event")}}._
 
 ## Examples