Auto merge of #15187 - montrivo:webidl-exposed, r=jdm

Partial - Expose interfaces only where they should be. #12415

<!-- Please describe your changes on the following line: -->

Reviewed webidl interfaces:

Location.webidl
MediaError.webidl
MimeTypeArray.webidl
MimeType.webidl
PageTransitionEvent.webidl
PluginArray.webidl
Plugin.webidl
PopStateEvent.webidl

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #12415 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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components/script/dom/webidls/MediaError.webidl

@@ -4,7 +4,7 @@
 
 // https://html.spec.whatwg.org/multipage/#mediaerror
 
-[Exposed=(Window,Worker)]
+[Exposed=Window]
 interface MediaError {
   const unsigned short MEDIA_ERR_ABORTED = 1;
   const unsigned short MEDIA_ERR_NETWORK = 2;

components/script/dom/webidls/MimeType.webidl

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // https://html.spec.whatwg.org/multipage/#mimetype
-[Exposed=(Window,Worker)]
+[Exposed=Window]
 interface MimeType {
   readonly attribute DOMString type;
   readonly attribute DOMString description;

components/script/dom/webidls/MimeTypeArray.webidl

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // https://html.spec.whatwg.org/multipage/#mimetypearray
-[LegacyUnenumerableNamedProperties, Exposed=(Window,Worker)]
+[LegacyUnenumerableNamedProperties, Exposed=Window]
 interface MimeTypeArray {
   readonly attribute unsigned long length;
   getter MimeType? item(unsigned long index);

components/script/dom/webidls/Plugin.webidl

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // https://html.spec.whatwg.org/multipage/#dom-plugin
-[LegacyUnenumerableNamedProperties, Exposed=(Window,Worker)]
+[LegacyUnenumerableNamedProperties, Exposed=Window]
 interface Plugin {
   readonly attribute DOMString name;
   readonly attribute DOMString description;

components/script/dom/webidls/PluginArray.webidl

@@ -3,7 +3,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // https://html.spec.whatwg.org/multipage/#pluginarray
-[LegacyUnenumerableNamedProperties, Exposed=(Window,Worker)]
+[LegacyUnenumerableNamedProperties, Exposed=Window]
 interface PluginArray {
   void refresh(optional boolean reload = false);
   readonly attribute unsigned long length;