Add AudioElement constructor to dart:html

lib/html/frog/html_frog.dart

Index: lib/html/frog/html_frog.dart
diff --git a/lib/html/frog/html_frog.dart b/lib/html/frog/html_frog.dart
index fc495a96c1319ba9036ccebac6145778d7315678..69de2f3b51f001301a15d6f439d92c135c30ddea 100644
--- a/lib/html/frog/html_frog.dart
+++ b/lib/html/frog/html_frog.dart
@@ -5693,10 +5693,13 @@ class _ElementAttributeMap implements AttributeMap {
     if (!containsKey(key)) {
       this[key] = ifAbsent();
     }
+    return this[key];
   }
 
   String remove(String key) {
+    String value = _element.$dom_getAttribute(key);
     _element.$dom_removeAttribute(key);
+    return value;
   }
 
   void clear() {
@@ -5772,9 +5775,8 @@ class _DataAttributeMap implements AttributeMap {
     $dom_attributes[_attr(key)] = '$value';
   }
 
-  String putIfAbsent(String key, String ifAbsent()) {
+  String putIfAbsent(String key, String ifAbsent()) =>
     $dom_attributes.putIfAbsent(_attr(key), ifAbsent);
-  }
 
   String remove(String key) => $dom_attributes.remove(_attr(key));
 
@@ -17643,7 +17645,8 @@ interface AudioChannelSplitter extends AudioNode {
 // WARNING: Do not edit - generated code.
 
 /// @domName AudioContext
-interface AudioContext extends EventTarget {
+interface AudioContext extends EventTarget default _AudioContextFactoryProvider {
+  AudioContext();
 
   /**
    * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent