Bug 1700889 - remove xmlspace attribute from SVGStyleElement r=emilio

No longer in SVG 2, was removed from webkit as part of https://bugs.webkit.org/show_bug.cgi?id=29058 and Chrome doesn't support this either.

Differential Revision: https://phabricator.services.mozilla.com/D109702

dom/svg/SVGStyleElement.cpp

@@ -138,14 +138,6 @@ void SVGStyleElement::ContentChanged(nsIContent* aContent) {
 
 //----------------------------------------------------------------------
 
-void SVGStyleElement::GetXmlspace(nsAString& aXmlspace) {
-  GetAttr(kNameSpaceID_XML, nsGkAtoms::space, aXmlspace);
-}
-
-void SVGStyleElement::SetXmlspace(const nsAString& aXmlspace, ErrorResult& rv) {
-  rv = SetAttr(kNameSpaceID_XML, nsGkAtoms::space, aXmlspace, true);
-}
-
 void SVGStyleElement::GetMedia(nsAString& aMedia) {
   GetAttr(nsGkAtoms::media, aMedia);
 }

dom/svg/SVGStyleElement.h

@@ -61,8 +61,6 @@ class SVGStyleElement final : public SVGStyleElementBase,
   NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
 
   // WebIDL
-  void GetXmlspace(nsAString& aXmlspace);
-  void SetXmlspace(const nsAString& aXmlspace, ErrorResult& rv);
   void GetMedia(nsAString& aMedia);
   void SetMedia(const nsAString& aMedia, ErrorResult& rv);
   void GetType(nsAString& aType);

dom/webidl/SVGStyleElement.webidl

@@ -12,8 +12,6 @@
 
 [Exposed=Window]
 interface SVGStyleElement : SVGElement {
-  [SetterThrows]
-  attribute DOMString xmlspace; // Spec claims this should be on SVGElement
   [SetterThrows]
   attribute DOMString type;
   [SetterThrows]