Remove changes upstreamed to SVG (#487)

See w3c/svgwg#934

spec/index.bs

@@ -1388,33 +1388,6 @@ partial interface ServiceWorkerContainer : EventTarget {
 };
 </pre>
 
-## Integration with SVG ## {#integration-with-svg}
-
-This document modifies the {{SVGAnimatedString}} interface to enforce Trusted Types:
-
-<pre class="idl exclude">
-[Exposed=Window]
-partial interface mixin SVGAnimatedString {
-           attribute (DOMString or TrustedScriptURL) baseVal;
-};
-</pre>
-
-On setting {{SVGAnimatedString/baseVal}}, the following steps are run:
-
-1. <ins>If the reflected <a spec="dom">attribute</a>'s element is a {{SVGScriptElement}}, set |value| to the result of executing [$Get Trusted Type compliant string$] algorithm, with the following arguments:</ins>
-
-      * <ins>{{TrustedScriptURL}} as |expectedType|,</ins>
-      * <ins>reflected attribute's {{Document}}'s [=relevant global object=] as |global|,</ins>
-      * <ins>specified value as |input|,</ins>
-      * <ins>`SVGScriptElement href` as |sink|,</ins>
-      * <ins>'script' as |sinkGroup|.</ins>
-
-    <ins>Otherwise, set |value| to the specified value.</ins>
-
-1. If the reflected attribute is not present, the {{SVGAnimatedString}} object is defined to additionally reflect a second, deprecated attribute, and that deprecated attribute is present, then set that deprecated attribute to <del>the specified value</del> <ins>|value|</ins>. Otherwise, set the reflected attribute to <ins>|value|</ins> <del>the specified value</del>.
-
-Note: SVG does not have a complete script processing model <a href="https://github.com/w3c/svgwg/issues/196">yet</a>. Trusted Types assumes that the attribute and text body modification protections behave similarly to ones for HTML scripts outlined in [[#enforcement-in-scripts]].
-
 ## Integration with execCommand ## {#integration-with-exec-command}
 
 This document modifies the following interfaces defined by the unofficial <a href="https://w3c.github.io/editing/docs/execCommand/">execCommand</a> document: