Always return a new Promise from getAvailability(). (#525)

* Always return a new Promise from getAvailability().

* Respond to comments

Author: markafoltz

index.html

@@ -995,7 +995,7 @@ <h4>
               Output
             </dt>
             <dd>
-              A <a>PresentationRequest</a> object
+              A new <a>PresentationRequest</a> object
             </dd>
           </dl>
           <ol>
@@ -1064,7 +1064,7 @@ <h4>
               Output
             </dt>
             <dd>
-              A {{Promise}}
+              A new {{Promise}}
             </dd>
           </dl>
           <ol>
@@ -1320,7 +1320,7 @@ <h4>
               Output
             </dt>
             <dd>
-              <var>P</var>, a {{Promise}}
+              <var>P</var>, a new {{Promise}}
             </dd>
           </dl>
           <ol>
@@ -1614,17 +1614,12 @@ <h4>
               Output
             </dt>
             <dd>
-              A {{Promise}}
+              A new {{Promise}}
             </dd>
           </dl>
           <ol>
-            <li>If there is an unsettled {{Promise}} from a previous call to
-            <a data-link-for="PresentationRequest">getAvailability</a> on <var>
-              presentationRequest</var>, return that {{Promise}} and abort
-              these steps.
-            </li>
-            <li>Otherwise, let <var>P</var> be a new {{Promise}} constructed in
-            the <a>JavaScript realm</a> of <var>presentationRequest</var>.
+            <li>Let <var>P</var> be a new {{Promise}} constructed in the
+            <a>JavaScript realm</a> of <var>presentationRequest</var>.
             </li>
             <li>Return <var>P</var>, but continue running these steps <a>in
             parallel</a>.