Bug 1672303 - part 1: Get rid of "dom.inputevent.inputtype.enabled" r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D94248

dom/webidl/InputEvent.webidl

@@ -14,7 +14,6 @@ interface InputEvent : UIEvent
 
   readonly attribute boolean       isComposing;
 
-  [Pref="dom.inputevent.inputtype.enabled"]
   readonly attribute DOMString inputType;
 
   [NeedsCallerType, Pref="dom.inputevent.data.enabled"]

modules/libpref/init/StaticPrefList.yaml

@@ -2048,12 +2048,6 @@
   value: true
   mirror: always
 
-# Is support for InputEvent.inputType enabled?
-- name: dom.inputevent.inputtype.enabled
-  type: bool
-  value: true
-  mirror: always
-
 # Whether to allow or disallow web apps to cancel `beforeinput` events caused
 # by MozEditableElement#setUserInput() which is used by autocomplete, autofill
 # and password manager.