Remove generated directories with 100s of files.

client/html/generated/html/dartium/StyleElement.dart

Index: client/html/generated/html/dartium/StyleElement.dart
diff --git a/client/html/generated/html/dartium/StyleElement.dart b/client/html/generated/html/dartium/StyleElement.dart
deleted file mode 100644
index 9aa5faecce511537095283d1a7440b263fe434f5..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/StyleElement.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-
-class _StyleElementImpl extends _ElementImpl implements StyleElement {
-  _StyleElementImpl._wrap(ptr) : super._wrap(ptr);
-
-  bool get disabled() => _wrap(_ptr.disabled);
-
-  void set disabled(bool value) { _ptr.disabled = _unwrap(value); }
-
-  String get media() => _wrap(_ptr.media);
-
-  void set media(String value) { _ptr.media = _unwrap(value); }
-
-  StyleSheet get sheet() => _wrap(_ptr.sheet);
-
-  String get type() => _wrap(_ptr.type);
-
-  void set type(String value) { _ptr.type = _unwrap(value); }
-}