Followup fixes to PeerConnection state machine.

webrtc.html

@@ -364,7 +364,10 @@ <h4>Operation</h4>
               <li>
                <p>The gathering process is done.</p>
 
-               <p>Let <var>newCandidate</var> be null.</p>
+               <p>Set <var>connection</var>'s
+               <a href="#dom-peerconnection-ice-gathering-state">ice gathering
+               state</a> to <code>completed</code> and let
+               <var>newCandidate</var> be null.</p>
               </li>
             </ul>
           </li>
@@ -720,15 +723,6 @@ <h3>Interface Definition</h3>
                 and abort this operation.</p>
               </li>
 
-              <li>
-                <p>Changes to the state of media transmission will occur when a
-                final answer is successfully applied. The description attribute
-                (<code><a>localDescription</a></code> or <code>
-                <a>remoteDescription</a></code> depending on the setting
-                operation) MUST return the previous description until the new
-                description is successfully applied.</p>
-              </li>
-
               <li>
                 <p>If a local description contains a different set of ICE
                 credentials, then the ICE Agent MUST trigger an ICE restart.
@@ -814,6 +808,14 @@ <h3>Interface Definition</h3>
                     is <code>closed</code>, then abort these steps.</p>
                   </li>
 
+                  <li>
+                    <p>Set <var>connection</var>'s description attribute
+                    (<code><a>localDescription</a></code> or <code>
+                    <a>remoteDescription</a></code> depending on the setting
+                    operation) to the <code><a>RTCSessionDescription</a></code>
+                    argument.</p>
+                  </li>
+
                   <li>
                     <p>If the local description was set,
                     <var>connection</var>'s <a href=