Bug 1489301 - Part 4: Remove unnecessary [Exposed=System] annotations, r=bzbarsky

We don't need to expose on both Window and System anymore, as Window now
implies System. I don't remove unnecessary [Exposed=Window] annotations, as
WebIDL upstream has removed PrimaryGlobal.

Differential Revision: https://phabricator.services.mozilla.com/D9399

dom/chrome-webidl/BrowsingContext.webidl

@@ -5,7 +5,7 @@
 
 interface nsIDocShell;
 
-[Exposed=(Window, System), ChromeOnly]
+[Exposed=Window, ChromeOnly]
 interface BrowsingContext {
   readonly attribute BrowsingContext? parent;
 

dom/chrome-webidl/ChromeUtils.webidl

@@ -14,7 +14,7 @@
  * C++ callers use a fast path, and never call the JSAPI or WebIDL methods of
  * this object.
  */
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface MozQueryInterface {
   [Throws]
   legacycaller any (IID aIID);
@@ -25,7 +25,7 @@ interface MozQueryInterface {
  * This is exposed in all the system globals where we can expose stuff by
  * default, so should only include methods that are **thread-safe**.
  */
-[ChromeOnly, Exposed=(Window,System,Worker)]
+[ChromeOnly, Exposed=(Window,Worker)]
 namespace ChromeUtils {
   /**
    * Serialize a snapshot of the heap graph, as seen by |JS::ubi::Node| and
@@ -148,7 +148,7 @@ namespace ChromeUtils {
  * Additional ChromeUtils methods that are _not_ thread-safe, and hence not
  * exposed in workers.
  */
-[Exposed=(Window,System)]
+[Exposed=Window]
 partial namespace ChromeUtils {
   /**
    * A helper that converts OriginAttributesDictionary to a opaque suffix string.

dom/chrome-webidl/DominatorTree.webidl

@@ -38,7 +38,7 @@ typedef unsigned long long NodeSize;
  *     its retained size is therefore significant (assuming no external
  *     references into the tree).
  */
-[ChromeOnly, Exposed=(Window,System,Worker)]
+[ChromeOnly, Exposed=(Window,Worker)]
 interface DominatorTree {
   /**
    * The `NodeId` for the root of the dominator tree. This is a "meta-root" in

dom/chrome-webidl/HeapSnapshot.webidl

@@ -7,7 +7,7 @@
 /**
  * A HeapSnapshot represents a snapshot of the heap graph
  */
-[ChromeOnly, Exposed=(Window,System,Worker)]
+[ChromeOnly, Exposed=(Window,Worker)]
 interface HeapSnapshot {
   /**
    * A time stamp of when the heap snapshot was taken, if available. Units are

dom/chrome-webidl/MatchGlob.webidl

@@ -9,7 +9,7 @@
  * occurrence of "?" in the glob matches any single literal character.
  */
 [Constructor(DOMString glob, optional boolean allowQuestion = true),
- ChromeOnly, Exposed=(Window,System)]
+ ChromeOnly, Exposed=Window]
 interface MatchGlob {
   /**
    * Returns true if the string matches the glob.

dom/chrome-webidl/MatchPattern.webidl

@@ -30,7 +30,7 @@ interface URI;
  *      the URL path must exactly match the pattern path.
  */
 [Constructor(DOMString pattern, optional MatchPatternOptions options),
- ChromeOnly, Exposed=(Window,System)]
+ ChromeOnly, Exposed=Window]
 interface MatchPattern {
   /**
    * Returns true if the given URI matches the pattern.
@@ -74,7 +74,7 @@ interface MatchPattern {
  * matches when any of its sub-patterns matches.
  */
 [Constructor(sequence<(DOMString or MatchPattern)> patterns, optional MatchPatternOptions options),
- ChromeOnly, Exposed=(Window,System)]
+ ChromeOnly, Exposed=Window]
 interface MatchPatternSet {
   /**
    * Returns true if the given URI matches any sub-pattern.

dom/chrome-webidl/PlacesEvent.webidl

@@ -12,12 +12,12 @@ enum PlacesEventType {
   "bookmark-added",
 };
 
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface PlacesEvent {
   readonly attribute PlacesEventType type;
 };
 
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface PlacesVisit : PlacesEvent {
   /**
    * URL of the visit.
@@ -76,7 +76,7 @@ interface PlacesVisit : PlacesEvent {
 /**
  * Base class for properties that are common to all bookmark events.
  */
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface PlacesBookmark : PlacesEvent {
   /**
    * The id of the item.
@@ -135,7 +135,7 @@ dictionary PlacesBookmarkAdditionInit {
   required boolean isTagging;
 };
 
-[ChromeOnly, Exposed=(Window,System), Constructor(PlacesBookmarkAdditionInit initDict)]
+[ChromeOnly, Exposed=Window, Constructor(PlacesBookmarkAdditionInit initDict)]
 interface PlacesBookmarkAddition : PlacesBookmark {
   /**
    * The item's index in the folder.

dom/chrome-webidl/PlacesObservers.webidl

@@ -6,13 +6,13 @@
 
 callback PlacesEventCallback = void (sequence<PlacesEvent> events);
 
-[ChromeOnly, Exposed=(Window,System),
+[ChromeOnly, Exposed=Window,
  Constructor(PlacesEventCallback callback)]
 interface PlacesWeakCallbackWrapper {
 };
 
 // Global singleton which should handle all events for places.
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 namespace PlacesObservers {
   [Throws]
   void addListener(sequence<PlacesEventType> eventTypes,

dom/chrome-webidl/PrecompiledScript.webidl

@@ -8,7 +8,7 @@
  * Represents a pre-compiled JS script, which can be repeatedly executed in
  * different globals without being re-parsed.
  */
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface PrecompiledScript {
   /**
    * Executes the script in the context of, and with the security principal

dom/chrome-webidl/PrioEncoder.webidl

@@ -4,7 +4,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 namespace PrioEncoder {
   [Throws, NewObject]
   PrioEncodedData encode(ByteString batchID, PrioParams params);

dom/chrome-webidl/PromiseDebugging.webidl

@@ -50,7 +50,7 @@ callback interface UncaughtRejectionObserver {
   void onConsumed(object p);
 };
 
-[ChromeOnly, Exposed=(Window,System)]
+[ChromeOnly, Exposed=Window]
 interface PromiseDebugging {
   /**
    * The various functions on this interface all expect to take promises but

dom/chrome-webidl/StructuredCloneHolder.webidl

@@ -8,7 +8,7 @@
  * A holder for structured-clonable data which can itself be cloned with
  * little overhead, and deserialized into an arbitrary global.
  */
-[ChromeOnly, Exposed=(Window,System,Worker),
+[ChromeOnly, Exposed=(Window,Worker),
  /**
   * Serializes the given value to an opaque structured clone blob, and
   * returns the result.

dom/webidl/AbortController.webidl

@@ -7,7 +7,7 @@
  * https://dom.spec.whatwg.org/#abortcontroller
  */
 
-[Constructor(), Exposed=(Window,Worker,System)]
+[Constructor(), Exposed=(Window,Worker)]
 interface AbortController {
   readonly attribute AbortSignal signal;
 

dom/webidl/AbortSignal.webidl

@@ -7,7 +7,7 @@
  * https://dom.spec.whatwg.org/#abortsignal
  */
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface AbortSignal : EventTarget {
   readonly attribute boolean aborted;
 

dom/webidl/AbstractWorker.webidl

@@ -4,7 +4,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-[NoInterfaceObject, Exposed=(Window,Worker,System)]
+[NoInterfaceObject, Exposed=(Window,Worker)]
 interface AbstractWorker {
     attribute EventHandler onerror;
 };

dom/webidl/Console.webidl

@@ -8,7 +8,7 @@
  * https://console.spec.whatwg.org/#console-namespace
  */
 
-[Exposed=(Window,Worker,WorkerDebugger,Worklet,System),
+[Exposed=(Window,Worker,WorkerDebugger,Worklet),
  ClassString="Console",
  ProtoObjectHack]
 namespace console {
@@ -146,7 +146,7 @@ dictionary ConsoleCounterError {
 };
 
 [ChromeOnly,
- Exposed=(Window,Worker,WorkerDebugger,Worklet,System)]
+ Exposed=(Window,Worker,WorkerDebugger,Worklet)]
 // This is basically a copy of the console namespace.
 interface ConsoleInstance {
   // Logging

dom/webidl/DOMError.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor(DOMString name, optional DOMString message = ""),
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface DOMError {
   [Constant, UseCounter]
   readonly attribute DOMString name;

dom/webidl/DOMException.webidl

@@ -16,7 +16,7 @@
 interface StackFrame;
 
 [NoInterfaceObject,
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface ExceptionMembers
 {
   // The nsresult associated with this exception.
@@ -66,7 +66,7 @@ Exception implements ExceptionMembers;
 // XXXkhuey this is an 'exception', not an interface, but we don't have any
 // parser or codegen mechanisms for dealing with exceptions.
 [ExceptionClass,
- Exposed=(Window, Worker,System),
+ Exposed=(Window, Worker),
  Constructor(optional DOMString message = "", optional DOMString name)]
 interface DOMException {
   // The name of the error code (ie, a string repr of |result|).

dom/webidl/DOMRequest.webidl

@@ -5,7 +5,7 @@
 
 enum DOMRequestReadyState { "pending", "done" };
 
-[Exposed=(Window,Worker,System), NoInterfaceObject]
+[Exposed=(Window,Worker), NoInterfaceObject]
 interface DOMRequestShared {
   readonly attribute DOMRequestReadyState readyState;
 
@@ -16,7 +16,7 @@ interface DOMRequestShared {
   attribute EventHandler onerror;
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface DOMRequest : EventTarget {
   // The [TreatNonCallableAsNull] annotation is required since then() should do
   // nothing instead of throwing errors when non-callable arguments are passed.

dom/webidl/DOMStringList.webidl

@@ -10,7 +10,7 @@
  * liability, trademark and document use rules apply.
  */
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface DOMStringList {
   readonly attribute unsigned long length;
   getter DOMString? item(unsigned long index);

dom/webidl/ErrorEvent.webidl

@@ -4,7 +4,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 [Constructor(DOMString type, optional ErrorEventInit eventInitDict),
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface ErrorEvent : Event
 {
   readonly attribute DOMString message;

dom/webidl/Event.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor(DOMString type, optional EventInit eventInitDict),
- Exposed=(Window,Worker,System), ProbablyShortLivingWrapper]
+ Exposed=(Window,Worker), ProbablyShortLivingWrapper]
 interface Event {
   [Pure]
   readonly attribute DOMString type;

dom/webidl/EventTarget.webidl

@@ -26,7 +26,7 @@ dictionary AddEventListenerOptions : EventListenerOptions {
 };
 
 [Constructor,
- Exposed=(Window,Worker,WorkerDebugger,AudioWorklet,System)]
+ Exposed=(Window,Worker,WorkerDebugger,AudioWorklet)]
 interface EventTarget {
   /* Passing null for wantsUntrusted means "default behavior", which
      differs in content and chrome.  In content that default boolean
@@ -65,6 +65,6 @@ partial interface EventTarget {
 // chrome easier.  This returns the window which can be used to create
 // events to fire at this EventTarget, or null if there isn't one.
 partial interface EventTarget {
-  [ChromeOnly, Exposed=(Window,System), BinaryName="ownerGlobalForBindings"]
+  [ChromeOnly, Exposed=Window, BinaryName="ownerGlobalForBindings"]
   readonly attribute WindowProxy? ownerGlobal;
 };

dom/webidl/FileReader.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor,
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface FileReader : EventTarget {
   // async read methods
   [Throws]

dom/webidl/IDBCursor.webidl

@@ -14,7 +14,7 @@ enum IDBCursorDirection {
     "prevunique"
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBCursor {
     readonly    attribute (IDBObjectStore or IDBIndex) source;
 
@@ -42,7 +42,7 @@ interface IDBCursor {
     IDBRequest delete ();
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBCursorWithValue : IDBCursor {
     [Throws]
     readonly    attribute any value;

dom/webidl/IDBDatabase.webidl

@@ -10,7 +10,7 @@
  * liability, trademark and document use rules apply.
  */
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBDatabase : EventTarget {
     readonly    attribute DOMString          name;
     readonly    attribute unsigned long long version;

dom/webidl/IDBFactory.webidl

@@ -23,7 +23,7 @@ dictionary IDBOpenDBOptions
  * http://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBFactory
  * for more information.
  */
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBFactory {
   [Throws, NeedsCallerType]
   IDBOpenDBRequest

dom/webidl/IDBFileHandle.webidl

@@ -8,7 +8,7 @@ dictionary IDBFileMetadataParameters
   boolean lastModified = true;
 };
 
-[Exposed=(Window,System)]
+[Exposed=(Window)]
 interface IDBFileHandle : EventTarget
 {
   readonly attribute IDBMutableFile? mutableFile;

dom/webidl/IDBFileRequest.webidl

@@ -4,7 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-[Exposed=(Window,System)]
+[Exposed=Window]
 interface IDBFileRequest : DOMRequest {
   readonly attribute IDBFileHandle? fileHandle;
   // this is deprecated due to renaming in the spec

dom/webidl/IDBIndex.webidl

@@ -18,7 +18,7 @@ dictionary IDBIndexParameters {
     DOMString? locale = null;
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBIndex {
     [SetterThrows]
     attribute DOMString name;

dom/webidl/IDBKeyRange.webidl

@@ -9,7 +9,7 @@
  * liability, trademark and document use rules apply.
  */
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBKeyRange {
   [Throws]
   readonly attribute any     lower;
@@ -33,7 +33,7 @@ interface IDBKeyRange {
   static IDBKeyRange bound (any lower, any upper, optional boolean lowerOpen = false, optional boolean upperOpen = false);
 };
 
-[Exposed=(Window,Worker,System),
+[Exposed=(Window,Worker),
  Func="mozilla::dom::IndexedDatabaseManager::ExperimentalFeaturesEnabled"]
 interface IDBLocaleAwareKeyRange : IDBKeyRange {
   [NewObject, Throws]

dom/webidl/IDBMutableFile.webidl

@@ -3,7 +3,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-[Exposed=(Window,System)]
+[Exposed=Window]
 interface IDBMutableFile : EventTarget {
   readonly attribute DOMString name;
   readonly attribute DOMString type;

dom/webidl/IDBObjectStore.webidl

@@ -12,7 +12,7 @@ dictionary IDBObjectStoreParameters {
     boolean                             autoIncrement = false;
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBObjectStore {
     [SetterThrows]
     attribute DOMString name;

dom/webidl/IDBOpenDBRequest.webidl

@@ -7,7 +7,7 @@
  * https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html#idl-def-IDBOpenDBRequest
  */
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBOpenDBRequest : IDBRequest {
                 attribute EventHandler onblocked;
 

dom/webidl/IDBRequest.webidl

@@ -13,7 +13,7 @@ enum IDBRequestReadyState {
     "done"
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBRequest : EventTarget {
     [Throws]
     readonly    attribute any                  result;

dom/webidl/IDBTransaction.webidl

@@ -19,7 +19,7 @@ enum IDBTransactionMode {
     "versionchange"
 };
 
-[Exposed=(Window,Worker,System)]
+[Exposed=(Window,Worker)]
 interface IDBTransaction : EventTarget {
     [Throws]
     readonly    attribute IDBTransactionMode mode;

dom/webidl/IDBVersionChangeEvent.webidl

@@ -16,7 +16,7 @@ dictionary IDBVersionChangeEventInit : EventInit {
 };
 
 [Constructor(DOMString type, optional IDBVersionChangeEventInit eventInitDict),
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface IDBVersionChangeEvent : Event {
     readonly    attribute unsigned long long  oldVersion;
     readonly    attribute unsigned long long? newVersion;

dom/webidl/IdleDeadline.webidl

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

dom/webidl/LegacyQueryInterface.webidl

@@ -10,10 +10,10 @@ interface IID;
 [NoInterfaceObject,
  // Need Exposed here, because this is a mixin onto things like Event
  // that are exposed in workers.
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface LegacyQueryInterface {
   // Legacy QueryInterface, only exposed to chrome code on the main thread.
-  [Exposed=(Window,System), ChromeOnly]
+  [Exposed=Window, ChromeOnly]
   nsISupports QueryInterface(IID iid);
 };
 

dom/webidl/MessageChannel.webidl

@@ -7,7 +7,7 @@
  * http://www.whatwg.org/specs/web-apps/current-work/#channel-messaging
  */
 
-[Constructor, Exposed=(Window,Worker,System)]
+[Constructor, Exposed=(Window,Worker)]
 interface MessageChannel {
   readonly attribute MessagePort port1;
   readonly attribute MessagePort port2;

dom/webidl/MessageEvent.webidl

@@ -8,7 +8,7 @@
  */
 
 [Constructor(DOMString type, optional MessageEventInit eventInitDict),
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface MessageEvent : Event {
   /**
    * Custom data associated with this event.

dom/webidl/MessagePort.webidl

@@ -7,7 +7,7 @@
  * http://www.whatwg.org/specs/web-apps/current-work/#channel-messaging
  */
 
-[Exposed=(Window,Worker,AudioWorklet,System)]
+[Exposed=(Window,Worker,AudioWorklet)]
 interface MessagePort : EventTarget {
   [Throws]
   void postMessage(any message, optional sequence<object> transferable = []);

dom/webidl/Promise.webidl

@@ -14,7 +14,6 @@ callback AnyCallback = any (any value);
 
 // Hack to allow us to have JS owning and properly tracing/CCing/etc a
 // PromiseNativeHandler.
-[NoInterfaceObject,
- Exposed=(Window,Worker,System)]
+[NoInterfaceObject, Exposed=(Window,Worker)]
 interface PromiseNativeHandler {
 };

dom/webidl/StreamFilter.webidl

@@ -57,7 +57,7 @@ enum StreamFilterStatus {
  * An interface which allows an extension to intercept, and optionally modify,
  * response data from an HTTP request.
  */
-[Exposed=(Window,System),
+[Exposed=Window,
  Func="mozilla::extensions::StreamFilter::IsAllowedInContext"]
 interface StreamFilter : EventTarget {
   /**

dom/webidl/StreamFilterDataEvent.webidl

@@ -13,7 +13,7 @@
 
 [Constructor(DOMString type, optional StreamFilterDataEventInit eventInitDict),
  Func="mozilla::extensions::StreamFilter::IsAllowedInContext",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface StreamFilterDataEvent : Event {
   /**
    * Contains a chunk of data read from the input stream.

dom/webidl/TCPServerSocket.webidl

@@ -15,7 +15,7 @@ dictionary ServerSocketOptions {
 
 [Constructor(unsigned short port, optional ServerSocketOptions options, optional unsigned short backlog = 0),
  Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface TCPServerSocket : EventTarget {
   /**
    * The port of this server socket object.

dom/webidl/TCPServerSocketEvent.webidl

@@ -5,7 +5,7 @@
 
 [Constructor(DOMString type, optional TCPServerSocketEventInit eventInitDict),
  Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface TCPServerSocketEvent : Event {
   readonly attribute TCPSocket socket;
 };

dom/webidl/TCPSocket.webidl

@@ -41,7 +41,7 @@ interface LegacyMozTCPSocket {
 
 [Constructor(DOMString host, unsigned short port, optional SocketOptions options),
  Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface TCPSocket : EventTarget {
   /**
    * Upgrade an insecure connection to use TLS. Throws if the ready state is not OPEN.

dom/webidl/TCPSocketErrorEvent.webidl

@@ -11,7 +11,7 @@
 
 [Constructor(DOMString type, optional TCPSocketErrorEventInit eventInitDict),
  Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface TCPSocketErrorEvent : Event {
   readonly attribute DOMString name;
   readonly attribute DOMString message;

dom/webidl/TCPSocketEvent.webidl

@@ -11,7 +11,7 @@
 
 [Constructor(DOMString type, optional TCPSocketEventInit eventInitDict),
  Func="mozilla::dom::TCPSocket::ShouldTCPSocketExist",
- Exposed=(Window,System)]
+ Exposed=Window]
 interface TCPSocketEvent : Event {
   /**
    * If the event is a "data" event, data will be the bytes read from the network;

dom/webidl/TextDecoder.webidl

@@ -11,7 +11,7 @@
  */
 
 [Constructor(optional DOMString label = "utf-8", optional TextDecoderOptions options),
- Exposed=(Window,Worker,System)]
+ Exposed=(Window,Worker)]
 interface TextDecoder {
   [Constant]
   readonly attribute DOMString encoding;

dom/webidl/TextEncoder.webidl

@@ -10,8 +10,7 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-[Constructor,
- Exposed=(Window,Worker,System)]
+[Constructor, Exposed=(Window,Worker)]
 interface TextEncoder {
   [Constant]
   readonly attribute DOMString encoding;

dom/webidl/URLSearchParams.webidl

@@ -14,7 +14,7 @@
  */
 
 [Constructor(optional (sequence<sequence<USVString>> or record<USVString, USVString> or USVString) init = ""),
- Exposed=(Window,Worker,WorkerDebugger,System)]
+ Exposed=(Window,Worker,WorkerDebugger)]
 interface URLSearchParams {
   void append(USVString name, USVString value);
   void delete(USVString name);

dom/webidl/Worker.webidl

@@ -13,7 +13,7 @@
  */
 
 [Constructor(USVString scriptURL, optional WorkerOptions options),
- Exposed=(Window,DedicatedWorker,SharedWorker,System)]
+ Exposed=(Window,DedicatedWorker,SharedWorker)]
 interface Worker : EventTarget {
   void terminate();
 
@@ -34,6 +34,6 @@ dictionary WorkerOptions {
 
 [Constructor(USVString scriptURL),
  Func="mozilla::dom::ChromeWorker::WorkerAvailable",
- Exposed=(Window,DedicatedWorker,SharedWorker,System)]
+ Exposed=(Window,DedicatedWorker,SharedWorker)]
 interface ChromeWorker : Worker {
 };