Bug 1853552 - Remove dom.visualviewport.enabled pref r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D188426

dom/webidl/VisualViewport.webidl

@@ -7,8 +7,7 @@
  * https://wicg.github.io/visual-viewport/#the-visualviewport-interface
  */
 
-[Pref="dom.visualviewport.enabled",
- Exposed=Window]
+[Exposed=Window]
 interface VisualViewport : EventTarget {
   readonly attribute double offsetLeft;
   readonly attribute double offsetTop;

dom/webidl/Window.webidl

@@ -794,7 +794,7 @@ partial interface Window {
 };
 
 partial interface Window {
-  [SameObject, Pref="dom.visualviewport.enabled", Replaceable]
+  [SameObject, Replaceable]
   readonly attribute VisualViewport visualViewport;
 };
 

modules/libpref/init/StaticPrefList.yaml

@@ -4251,12 +4251,6 @@
   value: 128
   mirror: always
 
-# Is support for Window.visualViewport enabled?
-- name: dom.visualviewport.enabled
-  type: bool
-  value: true
-  mirror: always
-
 # Is support for WebVR APIs enabled?
 # Disabled everywhere, but not removed.
 - name: dom.vr.enabled