Bug 1842451 - Remove dom.requestIdleCallback.enabled pref r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D183799

dom/base/nsGlobalWindowInner.cpp

@@ -3296,14 +3296,6 @@ bool nsGlobalWindowInner::IsPrivilegedChromeWindow(JSContext*, JSObject* aObj) {
              nsContentUtils::GetSystemPrincipal();
 }
 
-/* static */
-bool nsGlobalWindowInner::IsRequestIdleCallbackEnabled(JSContext* aCx,
-                                                       JSObject*) {
-  // The requestIdleCallback should always be enabled for system code.
-  return StaticPrefs::dom_requestIdleCallback_enabled() ||
-         nsContentUtils::IsSystemCaller(aCx);
-}
-
 /* static */
 bool nsGlobalWindowInner::DeviceSensorsEnabled(JSContext*, JSObject*) {
   return Preferences::GetBool("device.sensors.enabled");

dom/base/nsGlobalWindowInner.h

@@ -403,8 +403,6 @@ class nsGlobalWindowInner final : public mozilla::dom::EventTarget,
 
   static bool IsPrivilegedChromeWindow(JSContext*, JSObject* aObj);
 
-  static bool IsRequestIdleCallbackEnabled(JSContext* aCx, JSObject*);
-
   static bool DeviceSensorsEnabled(JSContext*, JSObject*);
 
   static bool CachesEnabled(JSContext* aCx, JSObject*);

dom/webidl/IdleDeadline.webidl

@@ -7,8 +7,7 @@
  * https://w3c.github.io/requestidlecallback/
  */
 
-[Exposed=Window,
- Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+[Exposed=Window]
 interface IdleDeadline {
   DOMHighResTimeStamp timeRemaining();
   readonly attribute boolean didTimeout;

dom/webidl/Window.webidl

@@ -746,10 +746,9 @@ partial interface Window {
 Window includes WindowOrWorkerGlobalScope;
 
 partial interface Window {
-  [Throws, Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
+  [Throws]
   unsigned long requestIdleCallback(IdleRequestCallback callback,
                                     optional IdleRequestOptions options = {});
-  [Func="nsGlobalWindowInner::IsRequestIdleCallbackEnabled"]
   undefined     cancelIdleCallback(unsigned long handle);
 };
 

modules/libpref/init/StaticPrefList.yaml

@@ -3544,12 +3544,6 @@
   value: 100
   mirror: always
 
-# Enable requestIdleCallback API
-- name: dom.requestIdleCallback.enabled
-  type: bool
-  value: true
-  mirror: always
-
 # Enable Screen Orientation lock
 - name: dom.screenorientation.allow-lock
   type: bool