Make dart:dom implementation types private so they don't muddle the docs.

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

 
-class AudioPannerNodeJs extends AudioNodeJs implements AudioPannerNode native "*AudioPannerNode" {
+class _AudioPannerNodeJs extends _AudioNodeJs implements AudioPannerNode native "*AudioPannerNode" {
 
   static final int EQUALPOWER = 0;
 
   static final int HRTF = 1;
 
   static final int SOUNDFIELD = 2;
 
-  AudioGainJs get coneGain() native "return this.coneGain;";
+  _AudioGainJs get coneGain() native "return this.coneGain;";
 
   num get coneInnerAngle() native "return this.coneInnerAngle;";
 
   void set coneInnerAngle(num value) native "this.coneInnerAngle = value;";
 
   num get coneOuterAngle() native "return this.coneOuterAngle;";
 
   void set coneOuterAngle(num value) native "this.coneOuterAngle = value;";
 
   num get coneOuterGain() native "return this.coneOuterGain;";
 
   void set coneOuterGain(num value) native "this.coneOuterGain = value;";
 
-  AudioGainJs get distanceGain() native "return this.distanceGain;";
+  _AudioGainJs get distanceGain() native "return this.distanceGain;";
 
   int get distanceModel() native "return this.distanceModel;";
 
   void set distanceModel(int value) native "this.distanceModel = value;";
 
   num get maxDistance() native "return this.maxDistance;";
 
   void set maxDistance(num value) native "this.maxDistance = value;";
 
   int get panningModel() native "return this.panningModel;";
 
   void set panningModel(int value) native "this.panningModel = value;";
 
   num get refDistance() native "return this.refDistance;";
 
   void set refDistance(num value) native "this.refDistance = value;";
 
   num get rolloffFactor() native "return this.rolloffFactor;";
 
   void set rolloffFactor(num value) native "this.rolloffFactor = value;";
 
   void setOrientation(num x, num y, num z) native;
 
   void setPosition(num x, num y, num z) native;
 
   void setVelocity(num x, num y, num z) native;
 }