Remove generated directories with 100s of files.

client/html/generated/html/dartium/WebGLContextAttributes.dart

Index: client/html/generated/html/dartium/WebGLContextAttributes.dart
diff --git a/client/html/generated/html/dartium/WebGLContextAttributes.dart b/client/html/generated/html/dartium/WebGLContextAttributes.dart
deleted file mode 100644
index ba7dda59f34ccf9e7518ac80e0ee4aa18634fb88..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/WebGLContextAttributes.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-
-class _WebGLContextAttributesImpl extends _DOMTypeBase implements WebGLContextAttributes {
-  _WebGLContextAttributesImpl._wrap(ptr) : super._wrap(ptr);
-
-  bool get alpha() => _wrap(_ptr.alpha);
-
-  void set alpha(bool value) { _ptr.alpha = _unwrap(value); }
-
-  bool get antialias() => _wrap(_ptr.antialias);
-
-  void set antialias(bool value) { _ptr.antialias = _unwrap(value); }
-
-  bool get depth() => _wrap(_ptr.depth);
-
-  void set depth(bool value) { _ptr.depth = _unwrap(value); }
-
-  bool get premultipliedAlpha() => _wrap(_ptr.premultipliedAlpha);
-
-  void set premultipliedAlpha(bool value) { _ptr.premultipliedAlpha = _unwrap(value); }
-
-  bool get preserveDrawingBuffer() => _wrap(_ptr.preserveDrawingBuffer);
-
-  void set preserveDrawingBuffer(bool value) { _ptr.preserveDrawingBuffer = _unwrap(value); }
-
-  bool get stencil() => _wrap(_ptr.stencil);
-
-  void set stencil(bool value) { _ptr.stencil = _unwrap(value); }
-}