Remove generated directories with 100s of files.

client/html/generated/html/frog/SVGMaskElement.dart

Index: client/html/generated/html/frog/SVGMaskElement.dart
diff --git a/client/html/generated/html/frog/SVGMaskElement.dart b/client/html/generated/html/frog/SVGMaskElement.dart
deleted file mode 100644
index ce4a2d3946a1873c45132b535769b78b600c315e..0000000000000000000000000000000000000000
--- a/client/html/generated/html/frog/SVGMaskElement.dart
+++ /dev/null
@@ -1,44 +0,0 @@
-
-class _SVGMaskElementImpl extends _SVGElementImpl implements SVGMaskElement native "*SVGMaskElement" {
-
-  final _SVGAnimatedLengthImpl height;
-
-  final _SVGAnimatedEnumerationImpl maskContentUnits;
-
-  final _SVGAnimatedEnumerationImpl maskUnits;
-
-  final _SVGAnimatedLengthImpl width;
-
-  final _SVGAnimatedLengthImpl x;
-
-  final _SVGAnimatedLengthImpl y;
-
-  // From SVGTests
-
-  final _SVGStringListImpl requiredExtensions;
-
-  final _SVGStringListImpl requiredFeatures;
-
-  final _SVGStringListImpl systemLanguage;
-
-  bool hasExtension(String extension) native;
-
-  // From SVGLangSpace
-
-  String xmllang;
-
-  String xmlspace;
-
-  // From SVGExternalResourcesRequired
-
-  final _SVGAnimatedBooleanImpl externalResourcesRequired;
-
-  // From SVGStylable
-
-  _SVGAnimatedStringImpl get _svgClassName() native "return this.className;";
-
-  // Use implementation from Element.
-  // final _CSSStyleDeclarationImpl style;
-
-  _CSSValueImpl getPresentationAttribute(String name) native;
-}