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

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

 
-class SVGAngleJs extends DOMTypeJs implements SVGAngle native "*SVGAngle" {
+class _SVGAngleJs extends _DOMTypeJs implements SVGAngle native "*SVGAngle" {
 
   static final int SVG_ANGLETYPE_DEG = 2;
 
   static final int SVG_ANGLETYPE_GRAD = 4;
 
   static final int SVG_ANGLETYPE_RAD = 3;
 
   static final int SVG_ANGLETYPE_UNKNOWN = 0;
 
   static final int SVG_ANGLETYPE_UNSPECIFIED = 1;
 
   int get unitType() native "return this.unitType;";
 
   num get value() native "return this.value;";
 
   void set value(num value) native "this.value = value;";
 
   String get valueAsString() native "return this.valueAsString;";
 
   void set valueAsString(String value) native "this.valueAsString = value;";
 
   num get valueInSpecifiedUnits() native "return this.valueInSpecifiedUnits;";
 
   void set valueInSpecifiedUnits(num value) native "this.valueInSpecifiedUnits = value;";
 
   void convertToSpecifiedUnits(int unitType) native;
 
   void newValueSpecifiedUnits(int unitType, num valueInSpecifiedUnits) native;
 }