Bug 1682030 - Remove HiddenPluginEvent. r=jmathies,webidl,edgar

HiddenPluginEvent is no longer used since NPAPI plugin support has been removed.

Differential Revision: https://phabricator.services.mozilla.com/D107159

dom/webidl/HiddenPluginEvent.webidl

@@ -1,15 +0,0 @@
-interface PluginTag;
-
-[ChromeOnly,
- Exposed=Window]
-interface HiddenPluginEvent : Event
-{
-  constructor(DOMString type, optional HiddenPluginEventInit eventInit = {});
-
-  readonly attribute PluginTag? tag;
-};
-
-dictionary HiddenPluginEventInit : EventInit
-{
-  PluginTag? tag = null;
-};

dom/webidl/moz.build

@@ -148,9 +148,6 @@ with Files("HTML*"):
 with Files("HashChangeEvent.webidl"):
     BUG_COMPONENT = ("Core", "DOM: Navigation")
 
-with Files("HiddenPluginEvent.webidl"):
-    BUG_COMPONENT = ("Core", "Plug-ins")
-
 with Files("IDB*"):
     BUG_COMPONENT = ("Core", "Storage: IndexedDB")
 
@@ -1083,7 +1080,6 @@ GENERATED_EVENTS_WEBIDL_FILES = [
     "GamepadEvent.webidl",
     "GPUUncapturedErrorEvent.webidl",
     "HashChangeEvent.webidl",
-    "HiddenPluginEvent.webidl",
     "ImageCaptureErrorEvent.webidl",
     "MediaQueryListEvent.webidl",
     "MediaRecorderErrorEvent.webidl",

tools/lint/eslint/eslint-plugin-mozilla/lib/environments/privileged.js

@@ -281,7 +281,6 @@ module.exports = {
     HashChangeEvent: false,
     Headers: false,
     HeapSnapshot: false,
-    HiddenPluginEvent: false,
     History: false,
     IDBCursor: false,
     IDBCursorWithValue: false,