Stop suppressing generation of bindings with Promise.

tools/dom/idl/dart/dart.idl

 // This file introduces / supplements and forces Dart declarations.
 
 [DartSupplemental,
  Constructor]
 interface AudioContext {
   // TODO(ager): Auto-generate this custom method when the info about retaining
   // typed arrays is in the IDL.
   [Custom] void decodeAudioData(ArrayBuffer audioData, AudioBufferCallback successCallback, AudioBufferCallback errorCallback);
 };
 
@@ skipping 335 matching lines @@
 
   [DartSuppress] void scrollTo(long x, long y);
   [DartSuppress] void scrollTo(long x, long y, Dictionary scrollOptions);
   [RaisesException] void scrollTo(long x, long y, optional Dictionary scrollOptions);
 
   [DartSuppress] void scroll(long x, long y);
   [DartSuppress] void scroll(long x, long y, Dictionary scrollOptions);
   [RaisesException] void scroll(long x, long y, optional Dictionary scrollOptions);
 };
 
-[DartSuppress]
-interface Promise {};
-
 [DartSupplemental]
 interface CanvasRenderingContext2D {
     [DartSuppress] void webkitPutImageDataHD(ImageData? imagedata, float dx, float dy);
     [DartSuppress] void webkitPutImageDataHD(ImageData? imagedata, float dx, float dy, float dirtyX, float dirtyY, float dirtyWidth, float dirtyHeight);
     [DartSuppress] ImageData webkitGetImageDataHD(float sx, float sy, float sw, float sh);
 };
 
 [DartSupplemental]
 interface AudioParam {
     [DartSuppress] void setTargetValueAtTime(float target, double time, double timeConstant);
@@ skipping 100 matching lines @@
     //              is Uint8Array or sequence<unsigned long>.  For now suppress
     //              the new operation. Vijay suggestion, and I think this makes
     //              sense, change dart:html to have a send operation that takes
     //              a List<int> and have custom handler to call the correct
     //              method.  The dart:blink library needs to do something else
     //              postfix the name with send_sequence (?).
     [DartSuppress] void send(sequence<unsigned long> data, optional double timestamp);
 };
 
 Element implements GlobalEventHandlers;