Move [StrictTypeChecking] to interface (from members), where possible

Source/modules/webaudio/AudioBufferSourceNode.idl

Index: Source/modules/webaudio/AudioBufferSourceNode.idl
diff --git a/Source/modules/webaudio/AudioBufferSourceNode.idl b/Source/modules/webaudio/AudioBufferSourceNode.idl
index 6edb157a18898c8e1a31d2933c6ab4d802bd6760..5ac1c0167d72157aa97220460a09ebe1ae5462c8 100644
--- a/Source/modules/webaudio/AudioBufferSourceNode.idl
+++ b/Source/modules/webaudio/AudioBufferSourceNode.idl
@@ -24,9 +24,10 @@
 
 // A cached (non-streamed), memory-resident audio source
 [
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    StrictTypeChecking,
 ] interface AudioBufferSourceNode : AudioSourceNode {
-    [StrictTypeChecking, RaisesException=Setter] attribute AudioBuffer buffer;
+    [RaisesException=Setter] attribute AudioBuffer buffer;
 
     const unsigned short UNSCHEDULED_STATE = 0;
     const unsigned short SCHEDULED_STATE = 1;