Revert recent changes to dart.idl.

tools/dom/idl/dart/dart.idl

Index: tools/dom/idl/dart/dart.idl
diff --git a/tools/dom/idl/dart/dart.idl b/tools/dom/idl/dart/dart.idl
index a6f2060b2805afd63f9d433fabc1dfbf534ca92c..0b1745700991a4f21b75923e8b30d626086311cd 100644
--- a/tools/dom/idl/dart/dart.idl
+++ b/tools/dom/idl/dart/dart.idl
@@ -1,8 +1,7 @@
 // This file introduces / supplements and forces Dart declarations.
 
 [Supplemental,
- Constructor,
- Conditional=WEB_AUDIO]
+ Constructor]
 interface AudioContext {};
 
 [Supplemental]
@@ -11,8 +10,7 @@ interface Document {
   CanvasRenderingContext getCSSCanvasContext(in DOMString contextId, in DOMString name, in long width, in long height);
 };
 
-[Supplemental,
- Conditional=WEB_AUDIO]
+[Supplemental]
 interface ScriptProcessorNode {
   [Suppressed] attribute EventListener onaudioprocess;
   [Custom] void _setEventListener(EventListener eventListener);