Add [TypeChecking=Unrestricted] to Web Audio interfaces

Source/modules/webaudio/AudioContext.idl

Index: Source/modules/webaudio/AudioContext.idl
diff --git a/Source/modules/webaudio/AudioContext.idl b/Source/modules/webaudio/AudioContext.idl
index 796254097c7b85a37480f88a7c9c9a7f2975c47d..de3eb8b62f620e743ef8fe6d4eeadc718f868c59 100644
--- a/Source/modules/webaudio/AudioContext.idl
+++ b/Source/modules/webaudio/AudioContext.idl
@@ -37,6 +37,7 @@ enum AudioContextState {
     ConstructorCallWith=Document,
     NoInterfaceObject,
     RaisesException=Constructor,
+    TypeChecking=Unrestricted,
 ] interface AudioContext : EventTarget {
     // All rendered audio ultimately connects to destination, which represents the audio hardware.
     readonly attribute AudioDestinationNode destination;