Use fields in hidden native DOM classes instead of getters/setters.

client/dom/generated/src/frog/RealtimeAnalyserNode.dart

 
 class _RealtimeAnalyserNodeJs extends _AudioNodeJs implements RealtimeAnalyserNode native "*RealtimeAnalyserNode" {
 
-  int get fftSize() native "return this.fftSize;";
+  int fftSize;
 
-  void set fftSize(int value) native "this.fftSize = value;";
+  final int frequencyBinCount;
 
-  int get frequencyBinCount() native "return this.frequencyBinCount;";
+  num maxDecibels;
 
-  num get maxDecibels() native "return this.maxDecibels;";
+  num minDecibels;
 
-  void set maxDecibels(num value) native "this.maxDecibels = value;";
-
-  num get minDecibels() native "return this.minDecibels;";
-
-  void set minDecibels(num value) native "this.minDecibels = value;";
-
-  num get smoothingTimeConstant() native "return this.smoothingTimeConstant;";
-
-  void set smoothingTimeConstant(num value) native "this.smoothingTimeConstant = value;";
+  num smoothingTimeConstant;
 
   void getByteFrequencyData(_Uint8ArrayJs array) native;
 
   void getByteTimeDomainData(_Uint8ArrayJs array) native;
 
   void getFloatFrequencyData(_Float32ArrayJs array) native;
 }