Sync SVG interfaces with the specs

Source/core/svg/SVGStyleElement.idl

Index: Source/core/svg/SVGStyleElement.idl
diff --git a/Source/core/svg/SVGStyleElement.idl b/Source/core/svg/SVGStyleElement.idl
index 482efa960ac3fe74620673930018db6379f4e2ed..afd2a331e9db599fd9d56349afa35a3079c48758 100644
--- a/Source/core/svg/SVGStyleElement.idl
+++ b/Source/core/svg/SVGStyleElement.idl
@@ -24,13 +24,19 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+// http://www.w3.org/TR/SVG2/styling.html#InterfaceSVGStyleElement
+
 interface SVGStyleElement : SVGElement {
-    attribute boolean disabled;
     attribute DOMString type;
     attribute DOMString media;
     [MeasureAs=SVGStyleElementTitle] attribute DOMString title;
 
-    // DOM Level 2 Style
-    readonly attribute StyleSheet sheet;
-};
+    // SVGStyleElement implements LinkStyle
+    // http://dev.w3.org/csswg/cssom/#the-linkstyle-interface
+    readonly attribute StyleSheet? sheet;
 
+    // TODO(philipj): The disabled attribute was not in SVG 1.1 and has been
+    // removed from HTMLLinkElement and HTMLStyleElement in the HTML spec:
+    // https://www.w3.org/Bugs/Public/show_bug.cgi?id=14703
+    [Measure] attribute boolean disabled;
+};