Update structured cloning for recent changes to HTML

Fixes w3c#1089.

webrtc.html

@@ -79,6 +79,13 @@ <h2>Terminology</h2>
     handlers</a></dfn> and <dfn><a href=
     "http://dev.w3.org/html5/spec/webappapis.html#event-handler-event-type">event
     handler event types</a></dfn> are defined in [[!HTML5]].</p>
+    <p>The terms <dfn><a href=
+    "https://html.spec.whatwg.org/multipage/infrastructure.html#serializable-objects">
+    serializable objects</a></dfn>, <dfn><a href=
+    "https://html.spec.whatwg.org/multipage/infrastructure.html#serialization-steps">
+    serialization steps</a></dfn>, and <dfn><a href=
+    "https://html.spec.whatwg.org/multipage/infrastructure.html#deserialization-steps">
+    deserialization steps</a></dfn> are defined in [[!HTML]].</p>
     <p>The terms <dfn>MediaStream</dfn>, <dfn>MediaStreamTrack</dfn>, and
     <dfn>MediaStreamConstraints</dfn> are defined in [[!GETUSERMEDIA]].</p>
     <p>The term <dfn>Blob</dfn> is defined in [[!FILEAPI]].</p>
@@ -4536,7 +4543,8 @@ <h2>RTCCertificate Interface</h2>
         "RTCCertificate-certificate">certificate</dfn>]]) that
         <code>RTCPeerConnection</code> uses to authenticate with a peer.</p>
         <div>
-          <pre class="idl">interface RTCCertificate {
+          <pre class="idl">[Serializable]
+interface RTCCertificate {
     readonly        attribute DOMTimeStamp expires;
     readonly        attribute FrozenArray&lt;RTCDtlsFingerprint&gt; fingerprints;
     // At risk due to lack of implementers' interest.
@@ -4593,31 +4601,36 @@ <h2>Methods</h2>
         contains unstructured binary data.</p>
         <p>Note that a <code>RTCCertificate</code> might not directly hold
         private keying material, this might be stored in a secure module.</p>
-        <p>The <code>RTCCertificate</code> object can be stored and retrieved
-        from persistent storage by an application. When a <a>user agent</a> is
-        required to obtain a structured clone [[!HTML]] of a
-        <code>RTCCertificate</code> object, it performs the following
-        steps:</p>
+
+        <p><code>RTCCertificate</code> objects are <a>serializable objects</a>
+        [[!HTML]]. Their <a>serialization steps</a>, given <var>value</var> and
+        <var>serialized</var>, are:</p>
+
         <ol>
-          <li>Let <var>input</var> and <var>memory</var> be the corresponding
-          inputs defined by the internal structured cloning algorithm, where
-          <var>input</var> represents a <code>RTCCertificate</code> object to
-          be cloned.</li>
-          <li>Let <var>output</var> be a newly constructed
-          <code>RTCCertificate</code> object.</li>
-          <li>Copy the value of the <code>expires</code> attribute from
-          <var>input</var> to <var>output</var>.</li>
-          <li>Let the [[<a>certificate</a>]] internal slot of <var>output</var>
-          be set to the result of invoking the internal structured clone
-          algorithm recursively on the corresponding internal slots of
-          <var>input</var>, with the slot contents as the new
-          "<var>input</var>" argument and <var>memory</var> as the new
-          "<var>memory</var>" argument.
-          </li>
-          <li>Let the [[<a>handle</a>]] internal slot of <var>output</var>
-          refer to the same private keying material represented by the
-          [[<a>handle</a>]] internal slot of <var>input</var>.
-          </li>
+          <li>Set <var>serialized</var>.[[\expires]] to the value of
+          <var>value</var>'s <code>expires</code> attribute.</li>
+
+          <li>Set <var>serialized</var>.[[\certificate]] to
+          a copy of the unstructured binary data in
+          <var>value</var>.[[<a>certificate</a>]].</li>
+
+          <li>Set <var>serialized</var>.[[\handle]] be a serialization of the
+          private keying material represented by
+          <var>value</var>.[[<a>handle</a>]].</li>
+        </ol>
+
+        <p>Their <a>deserialization steps</a>, given <var>serialized</var> and
+        <var>value</var>, are:</p>
+
+        <ol>
+          <li>Initialize <var>value</var>'s <code>expires</code> attribute to
+          contain <var>serialized</var>.[[\expires]].</li>
+
+          <li>Set <var>value</var>.[[<a>certificate</a>]] to
+          <var>serialized</var>.[[\certificate]].</li>
+
+          <li>Set <var>value</var>.[[<a>handle</a>]] to the private key material
+          resulting from deserializing <var>serialized</var>.[[\handle]].</li>
         </ol>
       </section>
     </section>