Remove generated directories with 100s of files.

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

Index: client/dom/generated/src/frog/SVGMaskElement.dart
diff --git a/client/dom/generated/src/frog/SVGMaskElement.dart b/client/dom/generated/src/frog/SVGMaskElement.dart
deleted file mode 100644
index 14344025f719269e66c908105d485c579633847f..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/SVGMaskElement.dart
+++ /dev/null
@@ -1,44 +0,0 @@
-
-class _SVGMaskElementJs extends _SVGElementJs implements SVGMaskElement native "*SVGMaskElement" {
-
-  final _SVGAnimatedLengthJs height;
-
-  final _SVGAnimatedEnumerationJs maskContentUnits;
-
-  final _SVGAnimatedEnumerationJs maskUnits;
-
-  final _SVGAnimatedLengthJs width;
-
-  final _SVGAnimatedLengthJs x;
-
-  final _SVGAnimatedLengthJs y;
-
-  // From SVGTests
-
-  final _SVGStringListJs requiredExtensions;
-
-  final _SVGStringListJs requiredFeatures;
-
-  final _SVGStringListJs systemLanguage;
-
-  bool hasExtension(String extension) native;
-
-  // From SVGLangSpace
-
-  String xmllang;
-
-  String xmlspace;
-
-  // From SVGExternalResourcesRequired
-
-  final _SVGAnimatedBooleanJs externalResourcesRequired;
-
-  // From SVGStylable
-
-  final _SVGAnimatedStringJs className;
-
-  // Use implementation from Element.
-  // final _CSSStyleDeclarationJs style;
-
-  _CSSValueJs getPresentationAttribute(String name) native;
-}