Bug 1489301 - Part 5: Expose all System-only objects on Window, r=bzbarsky

There is a limited number of these, and this allows me to completely remove
mention of the 'System' global.

In the future System-only exposure could be achieved using a [Func] enabler.

Differential Revision: https://phabricator.services.mozilla.com/D9400

dom/chrome-webidl/ChannelWrapper.webidl

@@ -41,7 +41,7 @@ enum MozContentPolicyType {
  * A thin wrapper around nsIChannel and nsIHttpChannel that allows JS
  * callers to access them without XPConnect overhead.
  */
-[ChromeOnly, Exposed=System]
+[ChromeOnly, Exposed=Window]
 interface ChannelWrapper : EventTarget {
   /**
    * Returns the wrapper instance for the given channel. The same wrapper is

dom/chrome-webidl/MozDocumentObserver.webidl

@@ -9,7 +9,7 @@ callback interface MozDocumentCallback {
   void onPreloadDocument(MozDocumentMatcher matcher, LoadInfo loadInfo);
 };
 
-[ChromeOnly, Constructor(MozDocumentCallback callbacks), Exposed=System]
+[ChromeOnly, Constructor(MozDocumentCallback callbacks), Exposed=Window]
 interface MozDocumentObserver {
   [Throws]
   void observe(sequence<MozDocumentMatcher> matchers);

dom/chrome-webidl/WebExtensionContentScript.webidl

@@ -9,7 +9,7 @@ interface WindowProxy;
 typedef (MatchPatternSet or sequence<DOMString>) MatchPatternSetOrStringSequence;
 typedef (MatchGlob or DOMString) MatchGlobOrString;
 
-[Constructor(MozDocumentMatcherInit options), ChromeOnly, Exposed=System]
+[Constructor(MozDocumentMatcherInit options), ChromeOnly, Exposed=Window]
 interface MozDocumentMatcher {
   /**
    * Returns true if the script's match and exclude patterns match the given
@@ -132,7 +132,7 @@ enum ContentScriptRunAt {
   "document_idle",
 };
 
-[Constructor(WebExtensionPolicy extension, WebExtensionContentScriptInit options), ChromeOnly, Exposed=System]
+[Constructor(WebExtensionPolicy extension, WebExtensionContentScriptInit options), ChromeOnly, Exposed=Window]
 interface WebExtensionContentScript : MozDocumentMatcher {
   /**
    * The earliest point in the load cycle at which this script should run. For

dom/chrome-webidl/WebExtensionPolicy.webidl

@@ -11,7 +11,7 @@ callback WebExtensionLocalizeCallback = DOMString (DOMString unlocalizedText);
  * Defines the platform-level policies for a WebExtension, including its
  * permissions and the characteristics of its moz-extension: URLs.
  */
-[Constructor(WebExtensionInit options), ChromeOnly, Exposed=System]
+[Constructor(WebExtensionInit options), ChromeOnly, Exposed=Window]
 interface WebExtensionPolicy {
   /**
    * The add-on's internal ID, as specified in its manifest.json file or its

dom/webidl/AddonManager.webidl

@@ -82,7 +82,7 @@ interface AddonManager : EventTarget {
   readonly attribute boolean permissionPromptsEnabled;
 };
 
-[ChromeOnly,Exposed=System,HeaderFile="mozilla/AddonManagerWebAPI.h"]
+[ChromeOnly,Exposed=Window,HeaderFile="mozilla/AddonManagerWebAPI.h"]
 interface AddonManagerPermissions {
   static boolean isHostPermitted(DOMString host);
 };