Add [TypeChecking=Unrestricted] to Web Audio interfaces

Source/modules/webaudio/PannerNode.idl

Index: Source/modules/webaudio/PannerNode.idl
diff --git a/Source/modules/webaudio/PannerNode.idl b/Source/modules/webaudio/PannerNode.idl
index c9785c3b9b7ca3ab390747bb0163f2b8b97cbb05..68475afe96389646a6d3900c5ab770c5db2b659c 100644
--- a/Source/modules/webaudio/PannerNode.idl
+++ b/Source/modules/webaudio/PannerNode.idl
@@ -35,7 +35,8 @@ enum DistanceModelType {
 
 [
     NoInterfaceObject,
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    TypeChecking=Unrestricted,
 ] interface PannerNode : AudioNode {
     // Default model for stereo is equalpower.
     attribute PanningModelType panningModel;
@@ -56,4 +57,4 @@ enum DistanceModelType {
     attribute double coneInnerAngle;
     attribute double coneOuterAngle;
     attribute double coneOuterGain;
-};
+};